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Reviews (4)
19 October 2021
insufficiently detailed
Slow to initiate.
difficult to figure out navigation in areas of high intersection concentrations.
Google Maps is superior.
05 December 2017
Happy with it
Does what I wanted
31 August 2016
GPSmap 640
Some of the menu items are difficult to locate and not always under a logical heading. I had to pick up the book for some of the more common features and in my opinion they should be a fast grab while under way. Another draw back is the dim screen. It is very hard to see in normal daylight conditions. The screen reflects background light such that you have to shade it to make stuff out. Otherwise it was a good bang for the buck. It does what it is supposed to do. I like the adjustable heading line with the mile markers. The mounting options worked well for me. It seems to use very little power.