doc: Mention that an APRS interval of 0 disables it entirely

And mention that the value is a time in seconds between APRS packets.

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

diff --git a/doc/altusmetrum.xsl b/doc/altusmetrum.xsl
index afc7eb891d4b1895a5e6e95779957fe88c4bdee9..ae10afe951956ca315c5783b006f9c8fc7a7c1d8 100644 (file)
--- a/doc/altusmetrum.xsl
+++ b/doc/altusmetrum.xsl
@@ -2944,9 +2944,10 @@ NAR #88757, TRA #12200
       <section>
        <title>APRS Interval</title>
        <para>
-         How often to transmit GPS information via APRS. This option
-         is available on TeleMetrum v2 and TeleMega
-         boards. TeleMetrum v1 boards cannot transmit APRS
+         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.