i haven't used it yet as I've found this app by accident just now: locus (Share your location end-to-end encrypted on decentralized servers using Nostr) - https://f-droid.org/app/app.myzel394.locus
i remembered your post and thought it may help
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
[Matrix/Element]Dead
much thanks to @gary_host_laptop for the logo design :)
i haven't used it yet as I've found this app by accident just now: locus (Share your location end-to-end encrypted on decentralized servers using Nostr) - https://f-droid.org/app/app.myzel394.locus
i remembered your post and thought it may help
Traccar, open source self hosted solution: https://www.traccar.org
Alternatively: Hauk
(No idea how they compare)
It seems that Hauk project is abandoned. Las commit was 2 years ago.