DG-100 GPS data logger support

Hello,
I'm working on a tool to download GPS tracks from the GlobalSat DG-100
data logger.
Information about this device can be found here, for example:
http://www.gpspassion.com/fr/articles.asp?id=214

My plan is to prepare my software for GPSBabel integration,
so I am asking you for comments on my code, whether syntax and
coding style look acceptable to you.
I'd like to know, basically, whether I'm on track. ;-)

There is also some support for device functions other than track
download, such as configuring the device or activating the GPS mouse
mode (live GPS). Are these features suitable for GPSBabel integration
at all?

An early version of my software is available for download here:
http://rtg.informatik.tu-chemnitz.de/~mpa/software/dg-100/dg100ctl-v0.01.c

It is a standalone program without any options, no user interface yet,
only plain text output so far, tested on Linux (Debian).
The desired actions can be chosen in the main() function.
To build it, enter:
$ gcc dg100ctl-v0.01.c -o dg100ctl

If you have a DG-100, I'd like to know whether my software works for you.
Especially welcome are tests with negative latitude or longitude.

My thanks go to Globalsat for releasing the specs, to Pixel_K for
writing the DG-100 Manager and publishing the Delphi source code,
and last, but not least, to the GPSBabel developers.

Best regards,
Mirko

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