[The other Sean]

Not sure where on the earth you are, but keep in mind terrain and it's affect on signal. Any time I use a phone app that is cell tower and or cell phone dependent, I tend to loose signal / real time tracking randomly while in heavily wooded areas. My handheld GPS is always on point.

 

[The other Sean]

Most apps these days (even Google maps) allow you to download maps to your phone for offline use. The GPS in your cellphone will work without a cell signal.

Sent from my XT1585 using Tapatalk

Not always. Again, heavily wooded areas, both on foot and in vehicle, I've had my cell drop the GPS signal enough that the app stopped working. My handheld garmin GPS is always on it's game.

 

[The other Sean]

For sure. I was just tossing out a caveat so the O.P. was aware. I've gone on epic hikes and bike rides only to find out the actual tracking was missing data or shut off.

 

[The other Sean]

Looks like Gaia GPS is now a free app (effective May 2017), but requires 'membership' for usage beyond the 7-day trial period.

Member level is $9.99/year.
Premium Member is $29.99/year. It includes NatGeo Trails Illustrated, France IGN, SwissTopo, NeoTreks US Topo, US Hunting (GMUs, public land, others), Motor Vehicle Use Maps (MVUM), and overlays such as hill-shading, contour lines, slope angle, etc.

I've just installed the app and will give it a try. Not sure on membership level yet.

Link: https://www.gaiagps.com/
I'm attaching a map screenshot from the site.

I've had the $29.99 membership for a few months now. Having the MVUM's is super nice. Between Gaia and Google maps off line on my $59 tablet, I've got what I need. I still feel the GPS antenna in my tablet is better than in my phone. This is in the thick woods of northern Minnesota, so YMMV.