Web alarm clock for 11:50 p.m.
You wake at 11:50 pm with the boat motor still below the high-tide line and the shore outside already dark. Before moving, give yourself a moment to get fully oriented, find your slippers and torch, and check that the path to the boat is clear. An alarm at 12:00 am can mark the point when you need to have the motor safely lifted.
Your boat motor is too valuable to leave the alert untested until the moment you rely on it. Set 11:50 pm briefly now, keep the alarm page open, and let a trial signal play so you can judge whether it is loud enough from where you are resting. Then reset it for the time you need. If the browser is no longer active or your phone has gone to sleep, the boat motor alert may not sound, so use a separate phone alarm as backup.
Carrying gear near the water calls for extra awareness after a late-evening wake-up. Around 11:50 pm, neighbourhood sounds may have faded, while waves, wind, dogs, karaoke, or a passing tricycle can suddenly cover a soft alert. Keep the phone close enough to hear but away from spray, and take the torch with you; quieter surroundings can also make footsteps and movement near the boat easier to notice.