Add some clarifying notes to the gpsmon documentation.

1 files changed, 8 insertions, 0 deletions

diff --git a/gpsmon.xml b/gpsmon.xml
index 1dc50464..dce57e90 100644
--- a/gpsmon.xml
+++ b/gpsmon.xml
@@ -186,6 +186,9 @@ probes will begin to be issued immediately.</para>
 mode; in particular, it will flip a SiRF chip into binary mode as if
 you had used the <quote>n</quote> command.  This is due to a
 limitation in the SiRF firmware that we can't fix.</para>
+
+<para>This command will generally do nothing after the first time you
+use it, because the device type will already have been discovered.</para>
 </listitem>
 </varlistentry>
 
@@ -219,6 +222,11 @@ correctly.</para>
 mode at current speed; with an argument of 1, change to binary
 (native) mode. With no argument, toggle the setting. Will show an
 error if the device doesn't have such modes.</para>
+
+<para>After you switch a dual-protocol GPS to NMEA mode wityh this
+command, it retains the information about the original type and its
+control capabilities. That is why the device type listed before the
+prompt doesn't change.</para>
 </listitem>
 </varlistentry>