Samsung 7" Tab 3 Lite refurb, was inexpensive (iirc $79 at the time), built-in GPS works fine. Android OS is dated and can't be updated further, but I don't care, does what I need.
I chose the 7" because it aligned with my dash setup and then-planned entertainment system mod.
Only problem with my dash mount is sun exposure, thing has a temp sensor and halts re-charging when the device gets hot. I just put my hat over it as a sun shade, when needed. OR de-mount the tablet to put it in front of my AC vents for a while.
Did a topic write-up on it, I'll go find the link
eta
https://www.expeditionportal.com/fo...-tablet-gps-mounts-please.130377/post-2075866
I'm considering a DJ Spark quadcopter soon and probably an IPad Air tablet to complement it and would then re-work the dash tablet mount setup for the iPad. Have to see if there are iPad app variants for my GPS-nav choices and my Torque app. Have to get an iPad-flavored bluetooth OBD-II dongle to replace my current setup.