I need some GPS-compatible PDA mapping programs?

Ok, so i got a Handspring Visor Prism (color screen) and i bought a GPS unit for it (a handy GPS off ebay) anyway, i heard it works with ubigo and Rand Mcnally streetfinder, well, i got a copy of streetfinder from a friend from his PDA, the only issue is that u have to download all the maps for it, and the site that u do it seems to be non-existent to new registration, and ubigo also seems non-existent, does anyone have any ideas? Its running OS 3.5