Maybe not exactly what you’re looking for, but this app could be useful someday: https://github.com/ligi/SurvivalManual It’s also available in F-Droid, but didn’t receive any updates for 4 years. It’s basically an easily navigatable pdf that tells you what to do in a survival situation

Thank you, I’ll try them out when I find the time :)

What did you replace it with? In my case I love my Nextcloud because I have my calendar, adress book, tasks, notes, RSS feed, etc. all in one app but I’m interested to hear alternatives to it

That looks nice. If you want to share it, I’d totally try it out!

I agree, the first two problems are rather easy to solve with phonetrack or any other of the tracking apps like µlogger, Owntracks, Traccar, etc. and nextcloud or the backend you provided. What is the reason that the simple heatmap is not ideal? Does it also lag or are you looking for filters functionality, etc.? The data pre processing must be challenging cause thats the part really seperating the self hosted solutions to Google’s one. If one could pre process the data on a nextcloud server and could render it on a map without significant lags, that would be really cool. Maybe I’ll try to work on that in the future when I got more advanced in programming.