>> global positioning alone provides reasonable accuracy. Huh?

What is more reasonable than accurate to 2 meters? When I use my WiFi iPAD I can get a 4-20 meter accuracy. When I use my BB with its GPS I usually see 2-3 meter accuracy. Even indoors I usually see less than 4 meters for accuracy. I find that the maps that are superimposed on the screen are less accurate.

The sensitivity of my BB beats any Garmin receiver that I have owned. It gets GPS signals inside coffee shops even when I'm sitting 20 feet away from the windows. However deeper inside of buildings, very heavy forests.etc can cause problems. Rural settings only GPS is available as I don't see too many hotspots on I90 between Spokane and Seattle. Go figure.