Hi Derek..its an old app called M Tracker. And its no longer available. It loads my OS maps off the phones memory..so doesn’t need connected to a signal.
Then it plots my course as I go..recording it as a GPX file. I then loaded the gpx file into my computer..and used Memory Map to display it.
Nowadays..Memory Map is available on Android..and does the same thing. Hope that helps..not a good screen shot of the app in the phone .. because of glare ..but you get the idea. The first map I posted is from the computer and is Memory Map.