Hi, that is an excellent question, but I'm not entirely sure what you are trying to achieve.
Are you trying to add some virtual points to a trip you are planning? (i.e. "at this point, I will have travelled 1 mile")
Or are you trying to add physical milestones (or historical milestones) into the shared geospation database called "OpenStreetMap"?
If so, the approach will be completely different.
You can get the fully unlocked version from F-Droid as well