Compass location server. I'm currently using ulogger on my phone feeding into PhoneTrack on a Nextcloud server (and then into my local Home Assistant) and find that it works surprisingly well but I'm always interested in options in case something happens with this...

One of the things I really like about PhoneTrack is that it has intelligence so I can have it backup my history and then scrub the current track going back any arbitrary time (I think mine scrubs every two weeks)