Treat this as an un-paid informercial, but we are in beta right now for our Android Nav app. It will include all of the NOAA Raster charts and Vector navaids, true GPS support, tracking and routing (eventually) and a few other goodies.
If you're interested in participating in the our beta, please follow this link EarthNC Android Beta | Google Groups
for instructions. Otherwise, we'll continue monitoring this and other threads for what we should be building.