using BackCountry Navigator
for now. i've also tried ViewRanger, Orux, and Trimble MyTopo. BCN had the best handling of large datasets, and a decent interface (but not great). it still crashes when trying to download a really large area at a high zoom level. i have a support ticket in and the developer is working with me on it. their first response was that it isn't meant to do that (download a whole state at zoom level 16
). i explained that there is currently no good solution for overland users and that there is a market for it. one good thing is that it lets you use the microSD card for map storage (which some apps don't). i've read that the XOOM is will support a 64GB microSDXC.
is actually by far the most mature and feature-rich GPS app out there, but it will only let you download maps in 512MB chunks and has no paid-for map source option. it also gives you no visual way to see what you already have downloaded so there is no easy way to piece together a whole state.
i really wish Garmin, Delorme, or National Geographic would release a topo app for Android. they seem to be the only players with vector based topo maps. until then, we're stuck with raster maps which take a long time to download and take up a ton of space.
for around town maps, traffic, and navigation, i'm using Google Maps
since i have a 4G device.
when on longer trips where internet service may cut out, i'm using CoPilot Live
for my road map and nav software. CoPilot does use vector maps and can download the entire US easily. it can show you alternate routes when doing navigation, speaks directions, has day and night themed maps, and actually does show many small forest roads. i've been using CoPilot with my phone for a while and it's only given me a completely wrong route once so far (as always, GPS is just an assistant, you still need some sense of where you are going). i also tried Sygic GPS Navigation and thought it was terrible. i have not tried the TomTom app, it's very expensive and only has mediocre reviews.
i've used the tablet twice now off-highway and have not had any problems with GPS reception (with the internal GPS unit).