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Countdown timer for the standing watch. Pick a preset (4-on/8-off bridge watch, 6-on/6-off coastal, or custom) or enter your own length. The timer runs in this browser tab; if you grant notification permission, you'll get a Web Notification when the watch ends, even if the tab is in the background.
Useful for keeping a private clock when you're a few minutes ahead of the official handover, or for tracking rest hours under STCW VIII (10 hours rest in 24, 77 in 7). For the rest-hours framework see /reference/watchkeeping.
240 minute timer
Notifications work in modern browsers (Chrome, Firefox, Safari, Edge). On iOS, notifications require a Home-screen-installed PWA.