I have used a handheld GPS for about 15 years now. My old unit died and I recently purchased a Garmin eTrex20. Lots of other good units even one that floats, but the eTrex20 was about the best for the least for my use at about $160.It allows aerial and satellite overlays. I have also downloaded free topo maps that have good coastal marsh maps for my new GPS.
I have added four links. The first link is to a GPS site that has reviews of GPS units. It is the eTrex20 review on the link. The second link is for a free downloadable map site. The last two links are for GPS android apps. I have yet to download any smart phone apps so I canít tell you much about that.
Custom Boat Graphics
Canoe/Kayak Storage Racks
Canoe Pack Liner
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