I use Arc which I've recommended on HN a few times. https://news.ycombinator.com/item?id=38662095 As a power user I find that it could be buggy but the developer behind it responds quickly on the forum. The developer also made another app with fewer features but FOSS: https://github.com/sobri909/ArcMini and it's been on my TODO list to use that as the basis to create my own location tracking app (I have some UI ideas for such an app in my mind).
The battery life impact is quite large. The iOS battery tool reports on the order of 5% to 10% but I think subjectively it feels much more than that. Getting GPS signals itself is IMO a bigger power draw than the app writing some time series data into a SQLite database (it defers expensive processing until the app enters the foreground).
The battery life impact is quite large. The iOS battery tool reports on the order of 5% to 10% but I think subjectively it feels much more than that. Getting GPS signals itself is IMO a bigger power draw than the app writing some time series data into a SQLite database (it defers expensive processing until the app enters the foreground).