Get one with Mapsource software that comes with it.
I have the Mapsource software on my laptop. When I get GPS numbers, I can put them in the software and download to the computer, or I can put them in the GPS and download them to the computer.
Every time I change something, I save the changes to a USB drive and/or a CD.
If anything goes south, I have the software to back up. Or if I get a new GPS, I can use the numbers I already have to download to the new GPS, I don't have to input each set of numbers, one at a time into the GPS, I just dump them all at one time.
And I have the maps in the software, so I can see where I am going before I get in the boat.
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