If the App was interrupted while tracking, you will hear an alarm when you return to or restart the App. Tracking will have stopped, and you will see a message:
The last plot will be assigned an event with the text Interrupt plot.
If interruption occurs before a minimum number (three) of locations has be plotted, the message is:
If you don't move during an extended period of time - approximately 15 minutes - tracking will stop to save battery, and the App will sound an alarm if it's in the foreground. A message notifies when it happened:
This means that if you don't explicitly end a track when arriving to a harbor, the App will end it for you.
The last plot will be assigned an event with the text Pause plot.
If you allowed Notification authorization, a notification similar to the message above appears if the app is in the background or your device is turned off.
In the App, plots and attached events are assigned timestamps measured in seconds. Incidentally - though very seldom - two plots / events may get the same timestamp, e.g. a periodic and a manual event can occur in the same second. That's ok, since the App has no requirement that timestamps are unique.
At the Sailor Logbook Website plots and events are stored with timestamp values copied from the App. However, here uniqueness is required. Therefore, if the situation occurs that two plots / events have same timestamp, the second of these is skipped. The upload screen informs on this:
Sailor Logbook S App manual - © Copyright 2018 CoaSoft ApS Denmark