You need to have an open view of the sky to get a solid fix from the satellites.  To check the satellites, select Preference | Satellite.  As I said before, once you have four satellites you can really start using the HandyGPS.  Somehow I was able to get the HandyGPS working inside my home (although Marcus still doesn't believe me).  I guess the walls are pretty thin next to my desk.  Outside, the HandyGPS works great.  I think this is a good module for hikers or anyone that enjoys the great outdoors.

Inside the vehicle, I could get the HandyGPS to work, but it was tricky.  As a passenger, I held the HandyGPS next to the window and it worked fine; I think using it when driving is a stretch.  Although I was able to get it working, because of the small text and street line size I think there should be a "navigator" person that holds the HandyGPS and tells you which way to turn.  Driving under overpasses sometimes lost some of the satellites that I was using.

One thing to remember if you have the Visor Prism is that it works very poorly in natural sunlight.  There is unfortuanately no color support currently in the HandyGPS.  The Prism does have the major benefit of working great at night, however.  Leave the daytime squinting to the navigator.  Let the person who called "Shotgun" have the responsibility so you can keep your eyes on the road.

GPS Accuracy

When you're moving, a large circle on-screen moves to the edge of the screen, then the screen refreshes with the circle back in the center.  The top of the map is always facing North.  The circle is easy to see, and the only time it becomes a problem is in UbiGo when the circle passes over text or icons.