Hi, did you end up with any tablet that works for you? GPS & high enough resolution? I am in the same situation – looking for such a device but doesn’t seem to exist but it appears to be a niche market.
I’ve read that GPS doesn’t work on Teclast X98 Air 3G well, and/or it doesn’t work at all in Windows. I don’t know why and no one seems to have a clue on what’s going on, even though the GPS module appears to be detected in Windows.
If it would work, it be great – Windows 10 allow offline maps. The only confirmed 8 inch tablet I had that work with offline Windows map & GPS is: Toshiba Encore 8 tablet – the earlier model has GPS. I had one of these before I broke the screen, so now seeking alternative but found surprisingly nothing.