I have a combination GPS/CDPD unit which interfaces with the empeg via serial PPP. It's on the net (see
http://empeg.orbit.mars.org/), but I have issues running PPP at the same time as the player. Since I'm away at a conference this week -- SC99, not Comdex, alas -- I left my empeg at home, so it's not currently acting like a stereo, and you're not going to see the GPS readout change at all.
I'm still working out some GPS issues with the vendor, but my hope is to be able to draw small maps on the empeg's display. An alternative would be to transmit the coordinate and/or map data to an external device like a Palm unit and display the map there.
I'll try to post more details under the Projects section of this BBS when I get a chance.
Cheers,
-v