Web alarm clock for 6:23 p.m.
As you hand over responsibility for collecting passengers from the arriving fast craft, set the alarm for 6:23 pm and tell the next person what it marks. That gives them a clear cue to head toward the jetty, check the arrival area, and be ready before 7:00 pm. Include the vessel name or passenger details in your handover so the pickup does not depend on memory alone.
Because the fast-craft pickup is passing to someone else, test the alarm sound now, while you can still confirm that it is loud enough and easy to recognise. Set a temporary alarm a minute ahead, listen for it, then remove the test and leave the 6:23 pm alarm active. A browser alarm cannot alert them if its page is closed or the phone goes to sleep, so the passengers could arrive without anyone waiting; keep the page open on an awake phone and use a separate phone alarm as backup.
Once the handover is complete this afternoon, protect the sleep that follows by preparing everything before you rest. Put the passenger names, jetty location, and any arrival update in one message, and place keys or identification where they are easy to find. With those details settled before 6:23 pm, neither you nor the person taking over needs a late clarification that cuts into the remaining sleep.