@Krzak first of all this is an historical french city so the blocs and streets are very small and narrow compared to US cities. It is also a fairly small part of the city showing most of the tracks, and it is very walkable. Lots of things to do and people to see there, so busy heatmap.
@Tenshi Traccar sending to Phonetrack on a Nextcloud server, https://floriananaya.pro/git/florian/PhoneTrackGPXFix to fix the GPX files, GPS Track Editor to clean them then JOSM to make it pretty.
GPS tracks recorded on foot, public transit and car.