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Sorry for late response--the GPS fits in the palm of your hand, so it's not a big screen but big enough I think--it has zoom capabilities so you can zoom all the way down to 20 ft--very helpful if you want to get exactly on your waypoint.
Yes you can rename them--you can also manually enter coordinates
Yes I did download the garmin detailed maps--I can't remember the name but it was for the se United States--I believe the basemap is not very
Detailed but what I downloaded has a lot of detail
I have a Delorme and they are pretty good. Puts me on target every time, removable storage (SD cards) and internal storage, manually enter waypoint names and gps coordinates, accepts navionics chip, and probably a few more features that I don't know about. When I found this unit all stores pretty much had a set price at $399 and I found what I believe was a mistake on the walmart website at $150. Needless to say, I immediately made the purchase. The base mapping is very generic (blue = water and green = land) but they do include certificates for free map downloads.