Okay, lemme tell you my setup:

I have an old Samsung 7" tablet that has a native, true GPS receiver built in that I use for flight data (rates of climb, airspeed, ground speed, etc) using the CloudAhoy app. I use it just for that, as the LCD screen is toast but there is enough to see the start icon and the start and stop buttons for recording. About 100 bucks.

For navigation, I just replaced my second Samsung, which I completely destroyed in the flip over, with a Nexus 7 Second Generation 7" tablet. It has true GPS reception, so no worries about the ability to locate. I bought it on Amazon, refurbished, for around 100 bucks. While there are a lot of apps - some free - for putting a little plane on a moving sectional and a magenta line, I like the iFly app.

The big thing about tablets is finding out which ones have true GPS receivers. Avoid anything with AGPS or a-GPS, as it, like the cake, is a lie. It's using networks and cell towers for location.

Heck, your smart phone (if you have one) might have a true GPS receiver in it.