a beep or quick tone/alarm sound ping'ing every X km's.
a different alarm/beep/wav sound played at a specific distance.. from the start of the recording.
Why? most of the time the app's screen is off for battery saving.. some alert for a vague indication you are X km from your start point would be useful.
Why? most of the time the app's screen is off for battery saving.. some alert for a vague indication you are X km from your start point would be useful.