There are many sources of off-grid power. Solar, wind, hydro being the big three.
> 2. If there's no power grid or internet, you probably have much bigger problems than "how can I browse an offline copy of Wikipedia." Those problems would probably last longer than you want to schlep around and item like this.
s/Wikipedia/GIS
Agreed, but that's the kind of thing that should be one of the first things you think about in these scenarios with powered electronics, and it wasn't treated here at all.
>> 2. If there's no power grid or internet, you probably have much bigger problems than "how can I browse an offline copy of Wikipedia." Those problems would probably last longer than you want to schlep around and item like this.
> s/Wikipedia/GIS
So let's say you have a reasonable doomsday requirement for maps. Why this thing, and not some paper maps? Or a kindle loaded with a bunch of street atlases?
I feel like you're looking at this from wrong perspective. It's not "how can this <thing> meet a requirement, but "what (combination of) things can best meet my requirements." The former will weigh you down with lot of albatrosses, the later may give you a usable toolkit.
If you wish to bake an apple pie from scratch, you must first invent the universe.
Of course, any discussion involving off grid power would involve a symposium on the chemistry of photovoltaic cells, an introduction to EM physics and silicon manufacturing.
Or just assume someone will figure out they need a solar pack from REI.
Sure, if you want to pay 3x higher for it than else where. I love REI, but my wallet hates it when I visit.
Actually, yeah. You can send away for them for free for most US states. Though it does seem like city street atlases aren't much of a thing anymore.