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I just bought a Garmin Etrex 20 and was hoping I could use it when we kayak unfamiliar streams, rivers, swamps, etc. 

I want to be able to backtrack to keep from getting lost, and perhaps look ahead on the map to see upcoming features.

I haven't taken it on a trip yet, and am assuming I  will I need to download some extra maps other than what comes with it.  Is that hard to do and how should I look for appropriate maps of this type as we travel form State to State (we are full time RVers)

Lot to ask, but hopefully someone else does this kind of stuff and can help me.

Thanks in advance