Here's what we did (thanks to advice from our members):
I have a basic Garmin B & W unit--200 bucks anywhere--connected, via a cable (20 bucks), to our laptop. Loaded in the laptop is the BlueChart software Garmin sells, complete with their (free) N-Route software to operate on the laptop. The result is a GIGANTIC, full color GPS you couldn't buy for under 5 grand. Visibility is excellent, and the standard Garmin Map76 unit has all the features (and more) than one needs.
Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell