Just another contributor.

Updating the basemap/reference map.

I usually only map areas that I have actual GPX data, have been to, or have some local knowledge, because I see constantly that imagery never seems to match, even on the more recent stuff.

From time to time, I also add a lot of POI to the map, and usually add them as nodes, instead of areas ( spent a lot of time adding POI as areas in chicago and it got wiped out when they added the buildings, that was lesson learned).

I use Raspberry pi running with Globalsat BU-353 GPS that I coded for GPX tracks. Accuracy has been pretty good.