add usage info

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+# Using Altus Metrum Products
+
+## Being Legal ##
+
+First off, in the US, you need an [amateur radio license](../Radio) or 
+other authorization to legally operate the radio transmitters that are part
+of our products.
+
+## In the Rocket ##
+
+In the rocket itself, you just need a [TeleMetrum](../TeleMetrum) board and 
+a LiPo rechargeable battery.  An 860mAh battery weighs less than a 9V 
+alkaline battery, and will run a [TeleMetrum](../TeleMetrum) for hours.
+
+By default, we ship TeleMetrum with a simple wire antenna.  If your 
+electronics bay or the airframe it resides within is made of carbon fiber, 
+which is opaque to RF signals, you may choose to have an SMA connector 
+installed so that you can run a coaxial cable to an antenna mounted 
+elsewhere in the rocket.
+
+## On the Ground ##
+
+To receive the data stream from the rocket, you need an antenna and short 
+feedline connected to one of our [TeleDongle](../TeleDongle) units.  The
+TeleDongle in turn plugs directly into the USB port on a notebook 
+computer.  Because TeleDongle looks like a simple serial port, your computer
+does not require special device drivers... just plug it in.
+
+Right now, all of our application software is written for Linux.  However, 
+because we understand that many people run Windows or MacOS, we are working 
+on a new ground station program written in Java that should work on all
+operating systems.
+
+After the flight, you can use the RF link to extract the more detailed data 
+logged in the rocket, or you can use a mini USB cable to plug into the 
+TeleMetrum board directly.  Pulling out the data without having to open up
+the rocket is pretty cool!  A USB cable is also how you charge the LiPo 
+battery, so you'll want one of those anyway... the same cable used by lots 
+of digital cameras and other modern electronic stuff will work fine.
+
+If your rocket lands out of sight, you may enjoy having a hand-held GPS 
+receiver, so that you can put in a waypoint for the last reported rocket 
+position before touch-down.  This makes looking for your rocket a lot like 
+Geo-Cacheing... just go to the waypoint and look around starting from there.
+
+You may also enjoy having a ham radio "HT" that covers the 70cm band... you 
+can use that with your antenna to direction-find the rocket on the ground 
+the same way you can use a Walston or Beeline tracker.  This can be handy 
+if the rocket is hiding in sage brush or a tree, or if the last GPS position 
+doesn't get you close enough because the rocket dropped into a canyon, or 
+the wind is blowing it across a dry lake bed, or something like that...
+
+So, to recap, on the ground the hardware you'll need includes:
+
+* an antenna and feedline
+* a TeleDongle
+* a notebook computer
+* optionally, a handheld GPS receiver
+* optionally, an HT or receiver covering 435 Mhz
+
+## Data Analysis ##
+
+Our software makes it easy to log the data from each flight, both the 
+telemetry received over the RF link during the flight itself, and the more
+complete data log recorded in the DataFlash memory on the TeleMetrum 
+board.  Once this data is on your computer, our postflight tools make it
+easy to view a standard set of plots showing the altitude, acceleration, and
+velocity of the rocket during flight.  You can also export a data file useable
+with Google Maps and Google Earth for visualizing the flight path in two or
+three dimensions.
+
+Our ultimate goal is to emit a set of files for each flight that can be
+published as a web page per flight, or just viewed on your local disk with 
+a web browser.
+
+## Future Plans ##
+
+In the future, we intend to offer "companion boards" for the rocket that will
+plug in to TeleMetrum to collect additional data, provide more pyro channels,
+and so forth.  A reference design for a companion board will be documented
+soon, and will be compatible with open source Arduino programming tools.
+
+We are also working on the design of a hand-held ground terminal that will
+allow monitoring the rocket's status, collecting data during flight, and
+logging data after flight without the need for a notebook computer on the
+flight line.  Particularly since it is so difficult to read most notebook
+screens in direct sunlight, we think this will be a great thing to have.
+

diff --git a/index.mdwn b/index.mdwn
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@@ -63,6 +63,8 @@ the set of hardware projects here.
 was Bdale's original project here, a dual-deploy rocketry altimeter.  One 
 prototype was built, but never flown.  This project is now indefinitely on hold.
 
+# [Using Altus Metrum Products](Using) #
+
 # Participants #
 
 * [Bdale Garbee](http://gag.com/~bdale)