Regatta chronometer OS310 white

Optimum Sailing Watch OS 315 has a 65mm wide ABS case.
Regatta special functions:
Sequenced start 5,4,1,0 ISAF with audible cues that can be suppressed
5 minutes, 3 minutes and multiples of 1 minute also programmable
"BouttoCountdown n Sync" for synchronization in case of difference
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Stopwatch waterproof to 50 m with a large display (16 mm) for easy reading. Special regatta functions: countdown with stop to calculate the time elapsed in handicap races and pre-programmed ISAF start sequences with sound signal. Large control buttons for easy access. ABS case (Ø 65 mm) and elastic strap allowing it to be worn on the wrist or over the sleeve. Fixing hook for mast or boom.