Get data out of a Garmin GPS 18 USB

Greetings

I need to get raw GPS data out of a Garmin GPS 18 USB device.

This is quiet hard because of the USB interface. The data only comes in
the Garmin protocol format and also the USB interface is not very well
accessible for higher programming languages like Java.

Now my question is:

Has anyone ever extracted the non-NMEA data out of the USB device?

The only way I managed to get anything at all out of the device was to
use the GPSGate Software from Franson. But unfortunately it only
provides the NMEA data. So I m still unable to send the command to
activate the additional data like the pseudo range, and also unable to
get anything directly.

The best help would be a code fragment which fits into the SDK which is
provided by Garmin itself. They provide a small program written in C
which sends the device the command to send its product data, receives
it and display it.

Unfortunately the process to get the satellite raw data is much more
complicated and it was impossible for me to get any further code or
help from Garmin.

So any help from anyone would be fantastic ;-)
It would be already great to get a software which can write the
non-nmea data in a text file or something... of course a dll or
anything else closer to programming would be better but I would be glad
to get anything at all.


Thanks in advance for any hints.

Best regards,

Bertram Weckmann

.

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