At sea the half-hour was never read off a clock — it was struck on the bell, counting up in pairs. A ship's-bell clock for Apple Watch, iPhone and Apple Vision Pro.
Seven watches divide the day; the bell strikes every half hour, one to eight glasses, in paired strokes — one bell, two bells… eight bells.
Split so the pattern never repeats. The British convention resets the last dog watch to 1·2·3·8; Continental (5·6·7·8) is offered too.
Only one device rings at a time — wrist, pocket, or room — so you never get a wall of chimes.
Two- and three-watch crew rotations tell you when your team has the watch — on the dial, the widget and the complications.
Fire, Fog (COLREGs Rule 35) and the SOLAS General Alarm — each documented and sourced, none invented.
On Apple Vision Pro, a procedurally-made bronze bell you hang on a real wall, ring by hand, and hear in spatial audio.
Whichever device is the bell, the others keep quiet. A single, synced sound model runs across all three: which glasses ring, what they sound like, and which device rings them.