I have a Garmin GPSMAP76CSx. I never have to transfer maps from the PC to the GPS as I bought the Mapsource road maps memory card. The memory card runs about $80.00 and contains maps of all the US & territories and most of Canada. I've used it driving from west Tennessee to Alaska and back, it never missed a beat. It has LOTS of useful software features, an altimeter, compass, is waterproof and it floats. I did have an issue with my first GPSMAP76CSx after it was out of warranty, USB power port died. Called Garmin and explained the problem to them. One year warranty was expired by six days. They replaced it at no cost, just had to pay shipping to and from. It's been going strong now for three years on the replacement unit. Garmin gets my vote.

Class III