Alternative to Life360?

I want to set up location sharing for my family/friends, but

• without having a closed source app having access to my location/sensors all the time
• be able to choose when I want to share

Any recommendations?

Edit for those who find this later: I ended up choosing Traccar suggested by @mbirth@lemmy.ml, but big thanks to everyone who brought some ideas to the table! I'll leave my configs here.

My Docker Compose file

My traccar.xml