the official app tries to not be killed by Android woth the usual tricks (permanent notification, disabling battery optimisation)

…

You can (theoretically) control how often locations are tracked and sent but for me was using the location service constantly and draining battery quite a bit.

Ah. Those are exactly what I was worried about. It’s not able to just happen entirely in the background the same way Google’s feature does, then? Kind of automagically?