I purchased a small Toshiba Tablet for b.o.b. ... $209 mid range mem & processor(amazon).
I added GPS Map software. (your choice=National Geographic 24k topo, Delorme 24k topo) these are about $80-100.
A $33 GPS receiver. (Global Sat micro usb)
PDF survival type info. (libertyman.com = http://www.thelibertyman.com/documents_index.shtml
A 15 watt 3 panel RAV solar back packable fold up unit for on the run charging, can be hung on pack w/clips (amazon).
Added a few tunes and couple free games Astronomy and whatever might suit u to pass time.
Word of caution on updating, only system and Defender, the extra or additional ones broke a few things and disabled some external switches, had to manually delete those updates to fix (pain). Windows you know.
It is a very nice tablet Win 8.1 works real nice, large touch keys,and the unit is very useful having gardening and mil survival stuff, vids or audio files for tech stuff and your free KJV Bible too!
Anyways thought I'd post about the PDF files and threw in what I've done.
If take this step I can help some via pm.
Dave
ps-NOT EMP PROOF- just abort term assistance... what good will that dollar be soon anyway? Spend, enjoy and flourish!