For those interesting in writing up a script to interpret key presses I've managed to trap the scan codes used by the 6 function keys on the touchscreen. Hope this is of use to someone. If I can rig one up I may write a program to run in the background and allow you to program these keys to perform ...

I tried pluggin in in a standard 3.5mm jack into my MW520's output to go to my stereo, the only hitch is it seems to be mono output. I ended up getting an external USB Sound Blaster to use as an output as I wanted to have the ability to play music.

Out of curiosity, any particular reason you're not using the built-in GPS on the MW520? By default the GPS that is built-in is going to spit out TAIP data, but using the TSIPChat programming tool you can set the GPS to output NMEA data which most every piece of mapping and GPS related software will ...