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General| Brand | Optimum Time |
|---|---|
| Model | OS 3 Series |
| Category | Watch |
| Language | English |
Details the sailing timer modes, sync, and audible signals for race timing.
Covers backlight, auto-return, clock functions, and daily alarm settings.
Explains the tide graph and tide predictor features available on select models.
Details the digital compass function for navigation and bearing.
Step-by-step guide to setting the watch's time, date, and daily alarm.
Explains countdown, count-up, and repeat timer modes and programming.
How to use the synchronize feature and manage audible timer signals.
Instructions for using the tide predictor and understanding its data.
How to enter and use the digital compass mode for bearing measurement.
Steps to calibrate the compass and adjust declination angles for accuracy.
Advice on wearing the watch, mounting it, and adjusting the elastic strap.
How to identify low battery warnings and replace the battery.
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