Re: Another undocumented Garmin protocol?

From: Markus Hoffmann (hoffmann_at_cip.physik.uni-bonn.de)
Date: 03/05/05 

Date: Sat, 5 Mar 2005 12:43:31 +0100

On Fri, 4 Mar 2005, Bruce Stemplewski wrote:

> This is undocumeneted right? How do you know it is the SATELLITE
> STATUS packet?

I guessed it. Like most other undocumented features. I found out, how to
get a screenshot etc. Most of these experimental codes were implemented
into my GPS-Software (http://gps-earth.sourceforge.net/). But my
GPS-devives use serial communication. But it appears to be at least very
similar with the USB-packets. Of course some packets are really obscur to
me. Like the ones to be sent for fimware upgrades, MAP upload etc.
But also here with some reverse engeneering and a lot of guesses, you
could find out. Have a look at the source code garmin.bas (even though you
might not run it). There are many "undocumented" features implemented,
like temperature readings, Screen messages, Button-Events. The concept of
GARMINs protocoll is, that you can get every information the device could
diplay also as packets. Also a full remote control of the device could be
implemented. If you find out more, let me know. regards M.