Gps

# apt-get install gpsd gpsd-client

# ls -al /dev/ttyUSB*
crw-rw---- 1 root dialout 188, 0 2011-04-26 23:26 /dev/ttyUSB0

# gpsd -n -N /dev/ttyUSB0

Testing;
# gpsmon
or
# cgps
or
# xgps

# gpsctl /dev/ttyUSB0 
gpsctl: no gpsd running or network error: can't connect to host/port pair.
gpsctl: attempting USB device enumeration.
gpsctl: 1d6b:0002 (bus 1, device 1)
gpsctl: 1d6b:0001 (bus 2, device 1)
gpsctl: 05e3:0608 (bus 1, device 3)
gpsctl: 413c:2003 (bus 2, device 2)
gpsctl: 0763:2012 (bus 2, device 3)
gpsctl: 03f0:9207 (bus 1, device 6)
gpsctl: 067b:2303 (bus 1, device 7)
gpsctl: 047d:105e (bus 1, device 8)
gpsctl: 03f0:8307 (bus 1, device 9)
gpsctl: vendor/product match with 091e:0003 not found
gpsctl: packet recognition timed out.