Just one reason I pre-flight my GPS routes on a computer before I leave. The Mapsource software that has come with each of my Garmin receivers will link directly to Google Earth so you can see the same terrain from a satellite view.

Anything off secondary roads I go with my 60CSx which also has topo maps installed. Still, that many people with children and they blindly follow a GPS with no back-up?
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Better is the Enemy of Good Enough.
Okay, what’s your point??