Tablet
Budget
My budget was less than $200 for a tablet. This is a dedicated navigation device; I do not plan to do anything else with it other than use it on the road. I have a Kindle Fire that I love for everything else, but these do not come with GPS. When looking around I noticed that there is somewhat of a "lull" in the tablet market as of spring 2019. Not many recent product introductions or innovations lately, some tablets on the market have been out a year or two or three. Samsung is the clear market leader, but high-end models are pricey. Asus seemed to have all of the features, but their Zenbook line is slightly dated and also pricey. I cannot comment on Ipads; I honestly do not know that much about them and was looking for an Android or Windows-based solution.
GPS
Obviously the thing must have a GPS sensor that works independently of Wifi or cell connection. Most do, but be careful reading reviews and such on
Amazon, Best Buy, etc. They will allow anyone to post on there, and it is clear some people are clueless. "Does this tablet have GPS?" - "Yes," "No," "Yes, but only when connected." "No, but it will show me where I am on a map." (???). Search through the specs to ensure it has GPS. Some also have GLONASS (Russian GPS), and some have "
Assisted GPS," which means different things depending on manufacturer. Generally, "Assisted GPS" or A-GPS means the device is hooking itself up to the cellular network rather than the GPS network to find location (most cellphones have this feature). But a tablet with only A-GPS will not work for our purposes.
Compass sensor
Some tablets have a compass sensor, which is self-explanatory. This sensor enables certain features in other programs like Gaia GPS, and then also obviously lets the device work like a compass on its own, like an iPhone.
Size
I took the Goldilocks approach to this. 7" was too small (not much bigger than a phone). 10" I thought was too big (but in retrospect it would have worked). 8" was what I wound up with.
I decided on this
Lenovo Tab 4 8". Price was right. It has GPS, A-GPS, GLONASS, and
Beidou (Chinese GPS - interesting). It does
not have a compass sensor. I decided to live without it. I can report that this device locks on quickly and has no immediate quirks that I have noticed so far.
Edit: Except one. Forget about looking at the tablet through sunglasses. Nothingness. People have reported on here that Ipads will allow you to do this. This tablet will not. Must remove shades to see.