Another option
I have a Magellan Meridien Color handheld GPS (Online runs about $330). Added Mapsend software for street level and topgraphic detail ($110+/-). Added Bizer waypoint file ($29) for a total of roughly $466. Now, this is NOT a marine chart like the C-Map Bizer full scale maps, so you can't go blazing around the lake at night in unfamiliar waters and assume every thing in your path is mapped (some chucklehead used a land based GPS at night and ran into Parker Island some years back as I recall!). However, if you use the track feature to mark your routes and take advantage of the waypoint file, you have a functional GPS for a limited purpose such as yours. I use mine primarily for fishing to track speed and location but have set routes for common trips as well, just in case of foggy or night travels. Not sure you even need the Mapsend software since the basic unit has resident maps on it. I hike as well and wanted the topo detail so bought it with the GPS. The nice thing about a handheld is you can use it for other non-marine purposes as well. Works great for me.
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