I recently picked up a Magellan Triton 300. The instruction manual is pretty good. I got my maps from the Nat Geo site www.topo.com.
I bought a set of the Topo Explorer maps. You get 25 Superquad map downloads for $24.95. The software is fairly easy to use and the maps are OK,

You always down load a manual from http://www.magellangps.com/ or you can use the "Ask Maggie" feature.
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Scott W. McClure
Photographer -
Scoutmaster Troop 202
Eagle Scout - BSA /
Vigil Honor - Order of the Arrow