i will try this with this device NL-402U ublox5 This Device should work out of the box with Linux see manuel http://www.navilock.de/view/PDFs/Linux_mit_uBlox/605
i've had similar problems with my sirf star III -based locosys btg-31. After looking at the source code i'd found the issue - only the the "GPGLL"-NMEA sentence was parsed.
Since my gps-device only supports GPGGA, GPRMC, GPGSA and GPGSV i've patched /src/host/layer23/src/common/gps.c to get the required data from GPGGA.
With that i'm also able to get "el-cheapo" support for gpsd (with help from socat and gpspipe):
/dev/ttyUSB0 // my gps-receiver device /dev/ttyACM0 // pseudo terminal (created with socat)
start gpsd and connect to the gps receiver # gpsd -N -n -D 4 /dev/ttyUSB0
create a pseudo terminal and feed it with the output of 'gpspipe -r' # socat -d -d pty,link=/dev/ttyACM0,raw,echo=0 "exec:gpspipe -r"
Now you can start cell_log and read the gps-data from the newly created pseudo terminal.
This is by no means a proper integration for gpsd as with libgps/libgpsd - but at least it works for me.
- Martin