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Provides countdown periods for sailing events with sync function for synchronization.
Indicates low battery level with an icon, checked hourly.
Activates for 3 seconds when the LIGHT button is pressed.
Returns display to real-time clock after 1 minute of inactivity in most modes.
Details the purpose of MODE, CLEAR, START/STOP, SYNC, and PROG buttons.
Explains how to set and view the real time, including seconds, hours, and minutes.
Details how to set a daily alarm and how it functions.
Describes how to select and use countdown/count-up timer options.
Explains programmable timer values for countdown-then-up and countdown repeat modes.
Describes audible signals for timer countdown sequences and how to enable/disable them.
Describes how to calculate tide status in three locations using the watch.
Explains how the tide graph in the dot matrix shows tide state.
Explains how to enter and use the compass for bearing measurement.
Provides steps for rotation calibration and adjusting declination angle.
Covers low battery indication and the procedure for changing the watch battery.
General| Brand | Optimum Time |
|---|---|
| Model | OS 4 Series |
| Category | Watch |
| Language | English |
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