Gaia GPS. Its an app for your phone using the internal GPS. It is a yearly subscription, Sometimes they have deals/sales. I put my phone on airplane mode to save battery life and it works fine. Saves your waypoints and routes to the cloud. You can later look at them online and you can also plan areas to hunt in on you laptop and they will be on the phone or tablet.
When my brother and i go to Maine bird hunting i use my 10 tablet on the dashboard instead of a small GPS unit. Has all of the logging roads and topo maps. Best of all if you loose the phone you maps and waypoints will still be avalible.
You could probably go back to where you lost the phone and be able to find it. When i first got it i carried a garmin as back up, but now the phone goes with me anyway for emergency use, one less thing to carry. Check them out on youtube.
Steve