The OsmAnd app for iOS and Android has a built-in location tracking functionality. This functionality can be enabled and could be used with the API interface of Waarzitje.nu.
1) Open the plugin settings menu
2) Enable the Trip recording plugin, and change the settings
4) Set up online tracking
First thing to do is pointing the OsmAnd app to the waarzitjenu/server API endpoint. Don't forget to turn it on!
Optionally, you can tell OsmAnd to keep the location updates for a while, in case you lost internet connection.
5) Enabling the widget for easily turning the location tracking on and off
It is possible to enable an on-screen widget that shows up in the upper right corner, which can be tapped to switch location tracking on and off.
Alright, you're all set up! 👍