Holux m241 is a GPS datalogger and receiver. You can either take it with you and log your track, or connect it to your computer and feed your favorite navigation software with it.
In order to view your GPS tracks in google earth or in other programs you need to extract it from the device. A good program for this job is gpsbabel. However the current ubuntu package is not capable of communicating to the M-241, therefor you need to compile the software on your own. The tarball can be downloaded from gpsbabel.org. In the end you will have a folder containing the source code and a binary called gpsbabel, you don’t have to install the binary to a special location.
First you need to install some packages for the compilation process, that can be removed afterwards. As said the gpsbabel package lacks some capabilities, though you can use apt-get to install the build-dependencies:
sudo apt-get build-dep gpsbabel
After that the standard ./configure && make will hopefully succeed.
The following extracts the tracks in the GPX format:
./gpsbabel -t -i m241 -f /dev/ttyUSB0 -o gpx -F track.gpx
For google earth you have to extract them in google’s own KML format:
./gpsbabel -t -i m241 -f /dev/ttyUSB0 -o kml -F track.kml