How to merge .gpx tracks and upload the track to the phone, so that later you can go and see in real time where you have already traveled?

Question

satellite navigation

For example, the goal is to go around the entire city with minimal duplication of routes.

Answer 1

gpx is a regular xml, you can stupidly cut out a piece of the route by the trkseg tag, or individual points by the trkpt tag and paste it where necessary.