/empeg/bin# ps auxww|grep gpsapp|grep -v grep|awk '{print $2}'|xargs kill

The above failes cuz there's no "xargs" or "awk" on the player.

Do it this way instead:

ps eaux|grep -i gpsapp

If that command returns a line or more of output, just take the second value printed and use that value as a parameter for "kill", as in "kill 11"

Then you can restart gpsapp and capture output:

rw
/drive0/var/gpsapp/gpsapp >/mumble
ro

The output is now in /mumble