2×1=10

I recently bought a Canmore GT-740FL GPS logger (labeled Sport LogBook 740FL GPS on Amazon) and found in a review that it can be read out with gpsbabel using the skytraq format (“SkyTraq Venus based loggers (download)”). That mode’s documentation states that the GT-750FL can be read out, which is indeed true as well for the GT-740FL (despite being a SiRFstar IV device).

On my Ubuntu box, the logger is available as an ACM device (basically a Hayes-style modem) under /dev/ttyACM0; check dmesg | grep tty to be sure.

Here’s the command line to download all tracks in GPX format into a tracks.gpx file.

sudo gpsbabel -i skytraq,baud=115200 -f /dev/ttyACM0 \
              -o gpx -F tracks.gpx

It seems though that gpsbabel downloads everything as a single track (except for manual waypoints, of course). Some sources suggest using baud=38400,initbaud=4800 instead of the 115200 baud option above when using Windows (and for the 730FL, to be exact); I didn't test that, however, as 115.2 kbaud worked fine for me.

To also delete the tracks, you may append the erase option or simply delete all tracks without downloading using -i skytraq,erase,no-output.

If you'd like to see live GPS data you may use minicom, e.g. with

sudo minicom -b 115200 -D /dev/ttyACM0

Use CTRL-A, Z to open minicom's menu, then X to exit.