Did a great test this week, using co pilot and Canada topo. The GPS unit locks fast and accurate. I have a 4 port USB charger and it kept everything at full battery. While in corner brook, I was at the local Walmart and saw a book called backroads mapbook. it was 15.95. It has every logging road, trail, track etc included. While reading I found out they have a app available. I am still figuring it all out, but all tracks are there and useable off line.
This is only available for Canadian provinces only however. But worth the money to have the updated topo maps.
I am 100% satisfied with my nav setup. The tablet is fast, readable and stable. The mount puts everything right in line of sight, and the apps I use keep me knowing where I am to at all times, plus with torque pro, my jeep is monitored for temps etc.
All in all a great budget solution for Overlanding/adventure trips.