Garmin Mobile XT
 

Is anybody using Garmin's smartphone software?
I just installed it on my Palm Pilot and it seems to be working okay, apart from it being pretty cloudy out. So far I've only given it a quick walk up and down the street to test it out, but I've got a question.

I only have the basic map installed, so the display is limited to only major roads. I've tried to download some detailed map files & put them on my phone, but Garmin won't recognize them. Does anybody know how to install more map files for Garmin Mobile XT on Palm devices?
I haven't found any answers doing several web searches.

Thanks