[DebianGIS-dev] Bug#456149: gpsdrive: Doesn't display my altitude

[Hamish]

fyi,

I was having this problem with my BU-353 USB-puck GPS a little while ago.
The gpsd "cgps" program put it into SiRF binary mode without me asking,
and that creates (AFAICT) pseudo-NMEA strings when a client asks for raw
mode.

this was with gpsdrive built from SVN (Oct 2008?) and I believe gpsd
2.36-2~bpo40+1 for debian etch from backports.org.

The "solution" was to reset the GPS to output in NMEA not binary SiRF
protocol using scripts/gpsd_nmea.sh from the gpsdrive source code.
which is just:
  echo "Switching the GPS connected to the local Gpsd into NMEA Mode ..."
  (echo "N=0"; sleep 1 )  | telnet localhost 2947


no idea if it helps with the Garmin,

Hamish