Phone based GPS option
If cost is important, you should also consider a phone based option if you have a smartphone. I am sure it is not quite as precise or complete but I use an app from Navionics on my android phone (they also have for an iPhone) and find it very useful. Not a substitute for a good map but I use it often when in an unfamiliar area or boating at night around the lake. Shows your real time position and also depth contours. I don't remember what I paid but I think it was about $10.
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