Unmooring
If you do not yet have a next voyage added (only origin but no destination visible in the voyage field), you can already start a next voyage by pressing 'Unmooring'.
Confirm the time of departure in the window that will pop-up.
Following you can start adding the next voyage.
IMPORTANT:
'Unmooring' immediately generates an ATD (Actual Time of Departure), so that no ETD (Estimated Time of Departure) has to be entered when creating the voyage.