From: Keith Packard <keithp@keithp.com>
Date: Thu, 5 Mar 2020 02:51:00 +0000 (-0800)
Subject: doc: Document APRS offset configuration value
X-Git-Tag: 1.9.3~1^2~49
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=d8716b015cfeb4955c0224c32d3c01e66b092209;p=fw%2Faltos

doc: Document APRS offset configuration value

Update screen shots including this as well.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/doc/aprs-operation.inc b/doc/aprs-operation.inc
index 09f929d0..d0e38266 100644
--- a/doc/aprs-operation.inc
+++ b/doc/aprs-operation.inc
@@ -1,12 +1,19 @@
 	=== APRS
 
 		{aprsdevices} can send APRS if desired, and the
-		interval between APRS packets can be configured. As each APRS
-		packet takes a full second to transmit, we recommend an
-		interval of at least 5 seconds to avoid consuming too much
-		battery power or radio channel bandwidth. You can configure
-		the APRS interval using {application}; that process is described in
-		<<{configure_section}>>.
+		interval between APRS packets can be configured. As
+		each APRS packet takes a full second to transmit, we
+		recommend an interval of at least 5 seconds to avoid
+		consuming too much battery power or radio channel
+		bandwidth. You can configure the time within each
+		minute that APRS transmits by changing the APRS offset
+		value. When the GPS signal is locked and knows the
+		current time, the APRS offset selects the time with
+		each minute for the first APRS transmission;
+		subsequent transmissions occur each APRS interval
+		seconds thereafter.  You can configure the APRS
+		interval and APRS offset using {application}; that
+		process is described in <<{configure_section}>>.
 
 		AltOS supports both compressed and uncompressed APRS
 		position report data formats. The compressed format
diff --git a/doc/config-device.inc b/doc/config-device.inc
index 5e3bdbf0..2e3d47d4 100644
--- a/doc/config-device.inc
+++ b/doc/config-device.inc
@@ -118,6 +118,16 @@ ifdef::radio[]
 		altitude with Compressed format. Test before
 		you fly to see which to use.
 
+	==== APRS Offset
+	
+		The delay from the top of the minute before sending
+		the first APRS packet of the minute. Coordinating
+		values for this parameter between multiple devices can
+		allow a single receiver to reliably receive APRS
+		packets from multiple devices. Note that this offset only
+		takes effect while the GPS signal is locked so that the
+		transmitting device knows the current time.
+		
 	==== Callsign
 
 		This sets the call sign included in each
diff --git a/doc/configure-altimeter.png b/doc/configure-altimeter.png
index 09a83d16..73c3dc33 100644
Binary files a/doc/configure-altimeter.png and b/doc/configure-altimeter.png differ
diff --git a/doc/telegps-configure.png b/doc/telegps-configure.png
index 56cb2031..4bc052f3 100644
Binary files a/doc/telegps-configure.png and b/doc/telegps-configure.png differ