How to use the online alarm clock
As you finish what you are doing and head out to take the boat through the lock before closing, a 4:36 pm alarm gives you a clear cue to leave. There are 24 minutes before 5:00 pm, enough for the final checks and the walk to the mooring if everything is already prepared.
For a lock deadline, discovering a silent alarm at the crucial moment is too late. Set 4:36 pm, keep the sound at a level you can hear, and test it briefly while you are still nearby. Check that your browser can play audio and that the volume has not been muted. A closed browser session or suspended handset silences this alarm, so the boat could miss its lock window; keep the alarm actively running until it sounds and use a separate backup if the timing cannot slip.
Anyone else in the house may hear an afternoon alarm just as they are working, resting or settling children after school. Tell them what the 4:36 pm signal means, then choose a clear tone that reaches you without carrying through every room. If someone is joining you at the boat, agree that the alarm marks departure rather than the start of getting ready, with coats, keys and safety gear gathered beforehand.
Common questions
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
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