GPS Integration Recommendations?

[Bill Binko]

Hi everyone,

I'm considering a handheld GPS unit, and would like to be able to take the 
maps I'm generating and send them down to the unit.  I've heard various 
suggestions (mainly on IRC) about generating GPX straight from PostGIS and 
things like that, but I was curious as to whether or not anyone here had 
done this?

For example, Garmin has maps that you can load via MapSource.  Is there 
any chance that I could generate those from the output of Mapserver?  
Perhaps taking SVG output and applying a XSL transform?

I'm just playing with the idea right now, but it seems like something 
someone here might have done.

Thanks for any input
Bill