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If you can charge your phone at the end of each day, I think this is the way to go. An iphone (or whatever) touch screen is incomparably easier to navigate. Has property boundaries, private property owner info, and all sort of basemaps to choose from. Just need to download before you go out of cell service.
Garmin Sux
Or a phone from a different maker that you can easily change the battery in the "field". I bought a spare OEM battery this year for $20. The way I used mine I could go many days with a couple of spare batteries.
I haven't looked seriously at solar chargers yet... but I may. Strapped on top of the backpack, several companies have this type of solution. Most these would cost me multiple spare batteries.