doc: Add asciidoc version of altosui chapter.

[fw/altos] / doc / altosui.inc

== AltosUI

        .AltosUI Main Window
        image::altosui.png[width="4.6in"]

        The AltosUI program provides a graphical user interface for
        interacting with the Altus Metrum product family. AltosUI can
        monitor telemetry data, configure devices and many other
        tasks. The primary interface window provides a selection of
        buttons, one for each major activity in the system.  This
        chapter is split into sections, each of which documents one of
        the tasks provided from the top-level toolbar.

        === Monitor Flight
        ////
              <subtitle>Receive, Record and Display Telemetry Data</subtitle>
        ////

                Selecting this item brings up a dialog box listing all
                of the connected TeleDongle devices. When you choose
                one of these, AltosUI will create a window to display
                telemetry data as received by the selected TeleDongle
                device.

                .Device Selection Dialog
                image::device-selection.png[width="3.1in"]

                All telemetry data received are automatically recorded
                in suitable log files. The name of the files includes
                the current date and rocket serial and flight numbers.

                The radio frequency being monitored by the TeleDongle
                device is displayed at the top of the window. You can
                configure the frequency by clicking on the frequency
                box and selecting the desired frequency. AltosUI
                remembers the last frequency selected for each
                TeleDongle and selects that automatically the next
                time you use that device.

                Below the TeleDongle frequency selector, the window
                contains a few significant pieces of information about
                the altimeter providing the telemetry data stream:

                 * The configured call-sign

                 * The device serial number

                 * The flight number. Each altimeter remembers how
                   many times it has flown.

                 * The rocket flight state. Each flight passes through
                   several states including Pad, Boost, Fast, Coast,
                   Drogue, Main and Landed.

                 * The Received Signal Strength Indicator value. This
                   lets you know how strong a signal TeleDongle is
                   receiving. At the default data rate, 38400 bps, in
                   bench testing, the radio inside TeleDongle v0.2
                   operates down to about -106dBm, while the v3 radio
                   works down to about -111dBm.  Weaker signals, or an
                   environment with radio noise may cause the data to
                   not be received. The packet link uses error
                   detection and correction techniques which prevent
                   incorrect data from being reported.

                 * The age of the displayed data, in seconds since the
                   last successfully received telemetry packet.  In
                   normal operation this will stay in the low single
                   digits.  If the number starts counting up, then you
                   are no longer receiving data over the radio link
                   from the flight computer.

                Finally, the largest portion of the window contains a
                set of tabs, each of which contain some information
                about the rocket.  They're arranged in 'flight order'
                so that as the flight progresses, the selected tab
                automatically switches to display data relevant to the
                current state of the flight. You can select other tabs
                at any time. The final 'table' tab displays all of the
                raw telemetry values in one place in a
                spreadsheet-like format.

                ==== Launch Pad

                        .Monitor Flight Launch Pad View
                        image::launch-pad.png[width="5.5in"]

                        The 'Launch Pad' tab shows information used to decide when the
                        rocket is ready for flight. The first elements include red/green
                        indicators, if any of these is red, you'll want to evaluate
                        whether the rocket is ready to launch:

                        Battery Voltage::
                        This indicates whether the Li-Po battery powering the
                        flight computer has sufficient charge to last for
                        the duration of the flight. A value of more than
                        3.8V is required for a 'GO' status.

                        Apogee Igniter Voltage::
                        This indicates whether the apogee
                        igniter has continuity. If the igniter has a low
                        resistance, then the voltage measured here will be close
                        to the Li-Po battery voltage. A value greater than 3.2V is
                        required for a 'GO' status.

                        Main Igniter Voltage::
                        This indicates whether the main
                        igniter has continuity. If the igniter has a low
                        resistance, then the voltage measured here will be close
                        to the Li-Po battery voltage. A value greater than 3.2V is
                        required for a 'GO' status.

                        On-board Data Logging::
                        This indicates whether there is space remaining
                        on-board to store flight data for the upcoming
                        flight. If you've downloaded data, but failed to erase
                        flights, there may not be any space left. Most of our
                        flight computers can store multiple flights, depending
                        on the configured maximum flight log size. TeleMini
                        v1.0 stores only a single flight, so it will need to
                        be downloaded and erased after each flight to capture
                        data. This only affects on-board flight logging; the
                        altimeter will still transmit telemetry and fire
                        ejection charges at the proper times even if the
                        flight data storage is full.

                        GPS Locked::
                        For a TeleMetrum or TeleMega device, this indicates
                        whether the GPS receiver is currently able to compute
                        position information. GPS requires at least 4
                        satellites to compute an accurate position.

                        GPS Ready::

                        For a TeleMetrum or TeleMega device, this indicates
                        whether GPS has reported at least 10 consecutive
                        positions without losing lock. This ensures that the
                        GPS receiver has reliable reception from the
                        satellites.

                        The Launchpad tab also shows the computed launch pad
                        position and altitude, averaging many reported
                        positions to improve the accuracy of the fix.

                ==== Ascent

                        .Monitor Flight Ascent View
                        image::ascent.png[width="5.5in"]

                        This tab is shown during Boost, Fast and Coast
                        phases. The information displayed here helps monitor the
                        rocket as it heads towards apogee.

                        The height, speed, acceleration and tilt are shown along
                        with the maximum values for each of them. This allows you to
                        quickly answer the most commonly asked questions you'll hear
                        during flight.

                        The current latitude and longitude reported by the GPS are
                        also shown. Note that under high acceleration, these values
                        may not get updated as the GPS receiver loses position
                        fix. Once the rocket starts coasting, the receiver should
                        start reporting position again.

                        Finally, the current igniter voltages are reported as in the
                        Launch Pad tab. This can help diagnose deployment failures
                        caused by wiring which comes loose under high acceleration.

                ==== Descent

                        .Monitor Flight Descent View
                        image::descent.png[width="5.5in"]

                        Once the rocket has reached apogee and (we hope)
                        activated the apogee charge, attention switches to
                        tracking the rocket on the way back to the ground, and
                        for dual-deploy flights, waiting for the main charge
                        to fire.

                        To monitor whether the apogee charge operated
                        correctly, the current descent rate is reported along
                        with the current height. Good descent rates vary based
                        on the choice of recovery components, but generally
                        range from 15-30m/s on drogue and should be below
                        10m/s when under the main parachute in a dual-deploy
                        flight.

                        With GPS-equipped flight computers, you can locate the
                        rocket in the sky using the elevation and bearing
                        information to figure out where to look. Elevation is
                        in degrees above the horizon. Bearing is reported in
                        degrees relative to true north. Range can help figure
                        out how big the rocket will appear. Ground Distance
                        shows how far it is to a point directly under the
                        rocket and can help figure out where the rocket is
                        likely to land. Note that all of these values are
                        relative to the pad location. If the elevation is near
                        90°, the rocket is over the pad, not over you.

                        Finally, the igniter voltages are reported in this tab
                        as well, both to monitor the main charge as well as to
                        see what the status of the apogee charge is.  Note
                        that some commercial e-matches are designed to retain
                        continuity even after being fired, and will continue
                        to show as green or return from red to green after
                        firing.

                ==== Landed

                        .Monitor Flight Landed View
                        image::landed.png[width="5.5in"]

                        Once the rocket is on the ground, attention switches
                        to recovery. While the radio signal is often lost once
                        the rocket is on the ground, the last reported GPS
                        position is generally within a short distance of the
                        actual landing location.

                        The last reported GPS position is reported both by
                        latitude and longitude as well as a bearing and
                        distance from the launch pad. The distance should give
                        you a good idea of whether to walk or hitch a ride.
                        Take the reported latitude and longitude and enter
                        them into your hand-held GPS unit and have that
                        compute a track to the landing location.

                        Our flight computers will continue to transmit RDF
                        tones after landing, allowing you to locate the rocket
                        by following the radio signal if necessary. You may
                        need to get away from the clutter of the flight line,
                        or even get up on a hill (or your neighbor's RV roof)
                        to receive the RDF signal.

                        The maximum height, speed and acceleration reported
                        during the flight are displayed for your admiring
                        observers.  The accuracy of these immediate values
                        depends on the quality of your radio link and how many
                        packets were received.  Recovering the on-board data
                        after flight may yield more precise results.

                        To get more detailed information about the flight, you
                        can click on the 'Graph Flight' button which will
                        bring up a graph window for the current flight.

                ==== Table

                        .Monitor Flight Table View
                        image::table.png[width="5.5in"]

                        The table view shows all of the data available from the
                        flight computer. Probably the most useful data on
                        this tab is the detailed GPS information, which includes
                        horizontal dilution of precision information, and
                        information about the signal being received from the satellites.

                ==== Site Map

                        .Monitor Flight Site Map View
                        image::site-map.png[width="5.5in"]

                        When the TeleMetrum has a GPS fix, the Site Map tab
                        will map the rocket's position to make it easier for
                        you to locate the rocket, both while it is in the air,
                        and when it has landed. The rocket's state is
                        indicated by color: white for pad, red for boost, pink
                        for fast, yellow for coast, light blue for drogue,
                        dark blue for main, and black for landed.

                        The map's default scale is approximately 3m (10ft) per
                        pixel. The map can be dragged using the left mouse
                        button. The map will attempt to keep the rocket
                        roughly centered while data is being received.

                        You can adjust the style of map and the zoom level
                        with buttons on the right side of the map window. You
                        can draw a line on the map by moving the mouse over
                        the map with a button other than the left one pressed,
                        or by pressing the left button while also holding down
                        the shift key. The length of the line in real-world
                        units will be shown at the start of the line.

                        Images are fetched automatically via the Google Maps
                        Static API, and cached on disk for reuse. If map
                        images cannot be downloaded, the rocket's path will be
                        traced on a dark gray background instead.

                        You can pre-load images for your favorite launch sites
                        before you leave home; check out the 'Preload Maps'
                        section below.

                ==== Igniter

                        .Monitor Flight Additional Igniter View
                        image::ignitor.png[width="5.5in"]

                        TeleMega includes four additional programmable pyro
                        channels. The Ignitor tab shows whether each of them has
                        continuity. If an ignitor has a low resistance, then the
                        voltage measured here will be close to the pyro battery
                        voltage. A value greater than 3.2V is required for a 'GO'
                        status.

        === Save Flight Data

                The altimeter records flight data to its internal
                flash memory.  TeleMetrum data is recorded at a much
                higher rate than the telemetry system can handle, and
                is not subject to radio drop-outs. As such, it
                provides a more complete and precise record of the
                flight. The 'Save Flight Data' button allows you to
                read the flash memory and write it to disk.

                Clicking on the 'Save Flight Data' button brings up a
                list of connected flight computers and TeleDongle
                devices. If you select a flight computer, the flight
                data will be downloaded from that device directly. If
                you select a TeleDongle device, flight data will be
                downloaded from a flight computer over radio link via
                the specified TeleDongle. See the chapter on
                Controlling An Altimeter Over The Radio Link for more
                information.

                After the device has been selected, a dialog showing
                the flight data saved in the device will be shown
                allowing you to select which flights to download and
                which to delete. With version 0.9 or newer firmware,
                you must erase flights in order for the space they
                consume to be reused by another flight. This prevents
                accidentally losing flight data if you neglect to
                download data before flying again. Note that if there
                is no more space available in the device, then no data
                will be recorded during the next flight.

                The file name for each flight log is computed
                automatically from the recorded flight date, altimeter
                serial number and flight number information.

        === Replay Flight

                Select this button and you are prompted to select a flight
                record file, either a .telem file recording telemetry data or a
                .eeprom file containing flight data saved from the altimeter
                flash memory.

                Once a flight record is selected, the flight monitor interface
                is displayed and the flight is re-enacted in real time. Check
                the Monitor Flight chapter above to learn how this window operates.

        === Graph Data

                Select this button and you are prompted to select a flight
                record file, either a .telem file recording telemetry data or a
                .eeprom file containing flight data saved from
                flash memory.

                Note that telemetry files will generally produce poor graphs
                due to the lower sampling rate and missed telemetry packets.
                Use saved flight data in .eeprom files for graphing where possible.

                Once a flight record is selected, a window with multiple tabs is
                opened.

                ==== Flight Graph

                        image::graph.png[width="5.5in"]

                        By default, the graph contains acceleration (blue),
                        velocity (green) and altitude (red).

                        The graph can be zoomed into a particular area by
                        clicking and dragging down and to the right. Once
                        zoomed, the graph can be reset by clicking and
                        dragging up and to the left. Holding down control and
                        clicking and dragging allows the graph to be panned.
                        The right mouse button causes a pop-up menu to be
                        displayed, giving you the option save or print the
                        plot.

                ==== Configure Graph

                        image::graph-configure.png[width="5.5in"]

                        This selects which graph elements to show, and, at the
                        very bottom, lets you switch between metric and
                        imperial units

                ==== Flight Statistics

                        image::graph-stats.png[width="5.5in"]

                        Shows overall data computed from the flight.

                ==== Map

                        image::graph-map.png[width="5.5in"]

                        Shows a satellite image of the flight area overlaid
                        with the path of the flight. The red concentric
                        circles mark the launch pad, the black concentric
                        circles mark the landing location.

        === Export Data

                This tool takes the raw data files and makes them
                available for external analysis. When you select this
                button, you are prompted to select a flight data file,
                which can be either a .eeprom or .telem.  The .eeprom
                files contain higher resolution and more continuous
                data, while .telem files contain receiver signal
                strength information.  Next, a second dialog appears
                which is used to select where to write the resulting
                file. It has a selector to choose between CSV and KML
                file formats.

                ==== Comma Separated Value Format

                        This is a text file containing the data in a form
                        suitable for import into a spreadsheet or other
                        external data analysis tool. The first few lines of
                        the file contain the version and configuration
                        information from the altimeter, then there is a single
                        header line which labels all of the fields. All of
                        these lines start with a '#' character which many
                        tools can be configured to skip over.

                        The remaining lines of the file contain the data, with
                        each field separated by a comma and at least one
                        space. All of the sensor values are converted to
                        standard units, with the barometric data reported in
                        both pressure, altitude and height above pad units.

                ==== Keyhole Markup Language (for Google Earth)

                        This is the format used by Google Earth to provide an
                        overlay within that application. With this, you can
                        use Google Earth to see the whole flight path in 3D.

        === Configure Altimeter

                image::configure-altimeter.png[width="3.6in"]

                Select this button and then select either an altimeter or
                TeleDongle Device from the list provided. Selecting a TeleDongle
                device will use the radio link to configure a remote altimeter.

                The first few lines of the dialog provide information about the
                connected device, including the product name,
                software version and hardware serial number. Below that are the
                individual configuration entries.

                At the bottom of the dialog, there are four buttons:

                Save::
                This writes any changes to the configuration parameter
                block in flash memory. If you don't press this button,
                any changes you make will be lost.

                Reset::
                This resets the dialog to the most recently saved
                values, erasing any changes you have made.

                Reboot::

                This reboots the device. Use this to switch from idle
                to pad mode by rebooting once the rocket is oriented
                for flight, or to confirm changes you think you saved
                are really saved.

                Close::

                This closes the dialog. Any unsaved changes will be
                lost.

                The rest of the dialog contains the parameters to be configured.

                ==== Main Deploy Altitude

                        This sets the altitude (above the recorded pad
                        altitude) at which the 'main' igniter will fire. The
                        drop-down menu shows some common values, but you can
                        edit the text directly and choose whatever you
                        like. If the apogee charge fires below this altitude,
                        then the main charge will fire two seconds after the
                        apogee charge fires.

                ==== Apogee Delay

                        When flying redundant electronics, it's often
                        important to ensure that multiple apogee charges don't
                        fire at precisely the same time, as that can over
                        pressurize the apogee deployment bay and cause a
                        structural failure of the air-frame. The Apogee Delay
                        parameter tells the flight computer to fire the apogee
                        charge a certain number of seconds after apogee has
                        been detected.

                ==== Apogee Lockout

                        Apogee lockout is the number of seconds after boost
                        where the flight computer will not fire the apogee
                        charge, even if the rocket appears to be at
                        apogee. This is often called 'Mach Delay', as it is
                        intended to prevent a flight computer from
                        unintentionally firing apogee charges due to the
                        pressure spike that occurrs across a mach
                        transition. Altus Metrum flight computers include a
                        Kalman filter which is not fooled by this sharp
                        pressure increase, and so this setting should be left
                        at the default value of zero to disable it.

                ==== Frequency

                        This configures which of the frequencies to use for
                        both telemetry and packet command mode. Note that if
                        you set this value via packet command mode, the
                        TeleDongle frequency will also be automatically
                        reconfigured to match so that communication will
                        continue afterwards.

                ==== RF Calibration

                        The radios in every Altus Metrum device are calibrated
                        at the factory to ensure that they transmit and
                        receive on the specified frequency.  If you need to
                        you can adjust the calibration by changing this value.
                        Do not do this without understanding what the value
                        means, read the appendix on calibration and/or the
                        source code for more information.  To change a
                        TeleDongle's calibration, you must reprogram the unit
                        completely.

                ==== Telemetry/RDF/APRS Enable

                        Enables the radio for transmission during
                        flight. When disabled, the radio will not
                        transmit anything during flight at all.

                ==== Telemetry baud rate

                        This sets the modulation bit rate for data
                        transmission for both telemetry and packet
                        link mode. Lower bit rates will increase range
                        while reducing the amount of data that can be
                        sent and increasing battery consumption. All
                        telemetry is done using a rate 1/2 constraint
                        4 convolution code, so the actual data
                        transmission rate is 1/2 of the modulation bit
                        rate specified here.

                ==== APRS Interval

                        How often to transmit GPS information via APRS
                        (in seconds). When set to zero, APRS
                        transmission is disabled. This option is
                        available on TeleMetrum v2 and TeleMega
                        boards. TeleMetrum v1 boards cannot transmit
                        APRS packets. Note that a single APRS packet
                        takes nearly a full second to transmit, so
                        enabling this option will prevent sending any
                        other telemetry during that time.

                ==== APRS SSID

                        Which SSID to report in APRS packets. By
                        default, this is set to the last digit of the
                        serial number, but can be configured to any
                        value from 0 to 9.

                ==== Callsign

                        This sets the call sign included in each
                        telemetry packet. Set this as needed to
                        conform to your local radio regulations.

                ==== Maximum Flight Log Size

                        This sets the space (in kilobytes) allocated
                        for each flight log. The available space will
                        be divided into chunks of this size. A smaller
                        value will allow more flights to be stored, a
                        larger value will record data from longer
                        flights.

                ==== Ignitor Firing Mode

                        This configuration parameter allows the two standard ignitor
                        channels (Apogee and Main) to be used in different
                        configurations.

                        Dual Deploy::
                        This is the usual mode of operation; the
                        'apogee' channel is fired at apogee and the
                        'main' channel at the height above ground
                        specified by the 'Main Deploy Altitude' during
                        descent.

                        Redundant Apogee::
                        This fires both channels at apogee, the
                        'apogee' channel first followed after a two
                        second delay by the 'main' channel.

                        Redundant Main::
                        This fires both channels at the height above
                        ground specified by the Main Deploy Altitude
                        setting during descent. The 'apogee' channel
                        is fired first, followed after a two second
                        delay by the 'main' channel.

                ==== Pad Orientation

                        Because they include accelerometers,
                        TeleMetrum, TeleMega and EasyMega are
                        sensitive to the orientation of the board. By
                        default, they expect the antenna end to point
                        forward. This parameter allows that default to
                        be changed, permitting the board to be mounted
                        with the antenna pointing aft instead.

                        Antenna Up::
                        In this mode, the antenna end of the flight
                        computer must point forward, in line with the
                        expected flight path.

                        Antenna Down::
                        In this mode, the antenna end of the flight
                        computer must point aft, in line with the
                        expected flight path.

                ==== Beeper Frequency

                        The beeper on all Altus Metrum flight
                        computers works best at 4000Hz, however if you
                        have more than one flight computer in a single
                        airframe, having all of them sound at the same
                        frequency can be confusing. This parameter
                        lets you adjust the base beeper frequency
                        value.

                ==== Configure Pyro Channels

                        image::configure-pyro.png[width="5.5in"]

                        This opens a separate window to configure the
                        additional pyro channels available on TeleMega
                        and EasyMega.  One column is presented for
                        each channel. Each row represents a single
                        parameter, if enabled the parameter must meet
                        the specified test for the pyro channel to be
                        fired.

                        Select conditions and set the related value;
                        the pyro channel will be activated when *all*
                        of the conditions are met. Each pyro channel
                        has a separate set of configuration values, so
                        you can use different values for the same
                        condition with different channels.

                        At the bottom of the window, the 'Pyro Firing
                        Time' configuration sets the length of time
                        (in seconds) which each of these pyro channels
                        will fire for.

                        Once you have selected the appropriate
                        configuration for all of the necessary pyro
                        channels, you can save the pyro configuration
                        along with the rest of the flight computer
                        configuration by pressing the 'Save' button in
                        the main Configure Flight Computer window.

                        include::pyro-channels.raw[]

        === Configure AltosUI

                image:configure-altosui.png[width="2.4in"]

                This button presents a dialog so that you can
                configure the AltosUI global settings.

                ==== Voice Settings

                        AltosUI provides voice announcements during
                        flight so that you can keep your eyes on the
                        sky and still get information about the
                        current flight status. However, sometimes you
                        don't want to hear them.

                        Enable::
                        Turns all voice announcements on and off

                        Test Voice::
                        Plays a short message allowing you to verify
                        that the audio system is working and the volume settings
                        are reasonable

                ==== Log Directory

                        AltosUI logs all telemetry data and saves all
                        TeleMetrum flash data to this directory. This
                        directory is also used as the staring point
                        when selecting data files for display or
                        export.

                        Click on the directory name to bring up a
                        directory choosing dialog, select a new
                        directory and click 'Select Directory' to
                        change where AltosUI reads and writes data
                        files.

                ==== Callsign

                        This value is transmitted in each command
                        packet sent from TeleDongle and received from
                        an altimeter.  It is not used in telemetry
                        mode, as the callsign configured in the
                        altimeter board is included in all telemetry
                        packets.  Configure this with the AltosUI
                        operators call sign as needed to comply with
                        your local radio regulations.

                        Note that to successfully command a flight
                        computer over the radio (to configure the
                        altimeter, monitor idle, or fire pyro
                        charges), the callsign configured here must
                        exactly match the callsign configured in the
                        flight computer.  This matching is case
                        sensitive.

                ==== Imperial Units

                        This switches between metric units (meters)
                        and imperial units (feet and miles). This
                        affects the display of values use during
                        flight monitoring, configuration, data
                        graphing and all of the voice
                        announcements. It does not change the units
                        used when exporting to CSV files, those are
                        always produced in metric units.

                ==== Font Size

                        Selects the set of fonts used in the flight
                        monitor window. Choose between the small,
                        medium and large sets.

                ==== Serial Debug

                        This causes all communication with a connected
                        device to be dumped to the console from which
                        AltosUI was started. If you've started it from
                        an icon or menu entry, the output will simply
                        be discarded. This mode can be useful to debug
                        various serial communication issues.

                ==== Manage Frequencies

                        This brings up a dialog where you can
                        configure the set of frequencies shown in the
                        various frequency menus. You can add as many
                        as you like, or even reconfigure the default
                        set. Changing this list does not affect the
                        frequency settings of any devices, it only
                        changes the set of frequencies shown in the
                        menus.

        === Configure Groundstation

                image:configure-groundstation.png[width="3.1in"]

                        Select this button and then select a
                        TeleDongle or TeleBT Device from the list
                        provided.

                        The first few lines of the dialog provide
                        information about the connected device,
                        including the product name, software version
                        and hardware serial number. Below that are the
                        individual configuration entries.

                        Note that TeleDongle and TeleBT don't save any
                        configuration data, the settings here are
                        recorded on the local machine in the Java
                        preferences database. Moving the device to
                        another machine, or using a different user
                        account on the same machine will cause
                        settings made here to have no effect.

                        At the bottom of the dialog, there are three
                        buttons:

                        Save::
                        This writes any changes to the local Java
                        preferences file. If you don't press this
                        button, any changes you make will be lost.

                        Reset::
                        This resets the dialog to the most recently
                        saved values, erasing any changes you have
                        made.

                        Close::
                        This closes the dialog. Any unsaved changes
                        will be lost.

                        The rest of the dialog contains the parameters
                        to be configured.

                ==== Frequency

                        This configures the frequency to use for both
                        telemetry and packet command mode. Set this
                        before starting any operation involving packet
                        command mode so that it will use the right
                        frequency. Telemetry monitoring mode also
                        provides a menu to change the frequency, and
                        that menu also sets the same Java preference
                        value used here.

                ==== RF Calibration

                        The radios in every Altus Metrum device are
                        calibrated at the factory to ensure that they
                        transmit and receive on the specified
                        frequency.  To change a TeleDongle or TeleBT's
                        calibration, you must reprogram the unit
                        completely, so this entry simply shows the
                        current value and doesn't allow any changes.

                ==== Telemetry Rate

                        This lets you match the telemetry and packet
                        link rate from the transmitter. If they don't
                        match, the device won't receive any data.

        === Flash Image

                This reprograms Altus Metrum devices with new
                firmware. TeleMetrum v1.x, TeleDongle v0.2, TeleMini
                and TeleBT are all reprogrammed by using another
                similar unit as a programming dongle (pair
                programming). TeleMega, EasyMega, TeleMetrum v2,
                EasyMini and TeleDongle v3 are all programmed directly
                over their USB ports (self programming).  Please read
                the directions for flashing devices in the Updating
                Device Firmware chapter below.

        === Fire Igniter

                image::fire-igniter.png[width="1.2in"]

                This activates the igniter circuits in the flight
                computer to help test recovery systems
                deployment. Because this command can operate over the
                Packet Command Link, you can prepare the rocket as for
                flight and then test the recovery system without
                needing to snake wires inside the air-frame.

                Selecting the 'Fire Igniter' button brings up the
                usual device selection dialog. Pick the desired
                device. This brings up another window which shows the
                current continuity test status for all of the pyro
                channels.

                Next, select the desired igniter to fire. This will
                enable the 'Arm' button.

                Select the 'Arm' button. This enables the 'Fire'
                button. The word 'Arm' is replaced by a countdown
                timer indicating that you have 10 seconds to press the
                'Fire' button or the system will deactivate, at which
                point you start over again at selecting the desired
                igniter.

        === Scan Channels

                image::scan-channels.png[width="3.2in"]

                This listens for telemetry packets on all of the
                configured frequencies, displaying information about
                each device it receives a packet from. You can select
                which of the baud rates and telemetry formats should
                be tried; by default, it only listens at 38400 baud
                with the standard telemetry format used in v1.0 and
                later firmware.

        === Load Maps

                image::load-maps.png[width="5.2in"]

                Before heading out to a new launch site, you can use
                this to load satellite images in case you don't have
                internet connectivity at the site.

                There's a drop-down menu of launch sites we know
                about; if your favorites aren't there, please let us
                know the lat/lon and name of the site. The contents of
                this list are actually downloaded from our server at
                run-time, so as new sites are sent in, they'll get
                automatically added to this list.  If the launch site
                isn't in the list, you can manually enter the lat/lon
                values

                There are four different kinds of maps you can view;
                you can select which to download by selecting as many
                as you like from the available types:

                Hybrid::
                A combination of satellite imagery and road data. This
                is the default view.

                Satellite::
                Just the satellite imagery without any annotation.

                Roadmap::
                Roads, political boundaries and a few geographic
                features.

                Terrain::
                Contour intervals and shading that show hills and
                valleys.

                You can specify the range of zoom levels to download;
                smaller numbers show more area with less
                resolution. The default level, 0, shows about
                3m/pixel. One zoom level change doubles or halves that
                number. Larger zoom levels show more detail, smaller
                zoom levels less.

                The Map Radius value sets how large an area around the
                center point to download. Select a value large enough
                to cover any plausible flight from that site. Be aware
                that loading a large area with a high maximum zoom
                level can attempt to download a lot of data. Loading
                hybrid maps with a 10km radius at a minimum zoom of -2
                and a maximum zoom of 2 consumes about 120MB of
                space. Terrain and road maps consume about 1/10 as
                much space as satellite or hybrid maps.

                Clicking the 'Load Map' button will fetch images from
                Google Maps; note that Google limits how many images
                you can fetch at once, so if you load more than one
                launch site, you may get some gray areas in the map
                which indicate that Google is tired of sending data to
                you. Try again later.

        === Monitor Idle

                image::monitor-idle.png[width="5.2in"]

                This brings up a dialog similar to the Monitor Flight
                UI, except it works with the altimeter in “idle” mode
                by sending query commands to discover the current
                state rather than listening for telemetry
                packets. Because this uses command mode, it needs to
                have the TeleDongle and flight computer callsigns
                match exactly. If you can receive telemetry, but
                cannot manage to run Monitor Idle, then it's very
                likely that your callsigns are different in some way.

                You can change the frequency and callsign used to
                communicate with the flight computer; they must both
                match the configuration in the flight computer
                exactly.