National Geographic NG730 series Instruction Manual - page 6
Mode 2 - Measuring Split Times
- Unscrew and press push button A to start the chronograph count.
- Unscrew and press push button B to stop the count and activate the
split time function. The watch keeps counting the elapsed time in the
background.
- Press push button B again to restart the count. The chronograph hand
will advance to add the time elapsed after the split time was activated.
- Press push button A to stop the chronograph count.
- Press push button B to reset the chronograph to zero.
CHRONOGRAPH CALIBRATION
Note: This step is to be followed after the battery has been exchanged or
the chronograph has been mishandled (when after resetting, the
chronograph hand will not default to zero).
- Minute hand calibration: Press push buttons A and B simultaneously.
Press button B repeatedly until the 30 minute hand sub dial is on 30.
- Second hand calibration: Press push button A repeatedly until the
chronograph hand is on zero.
- Press push buttons A and B simultaneously to exit. Screw down push
buttons.
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