National Geographic NG770B, Instruction Manual

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(2) Setting the Time
After setting the day, set the hour (and 24 hour) and minute hands.
Turn the hour/minute hands clockwise to set the time.
To ensure the time is set accurately, first turn the minute hand five
minutes ahead of desired time and then turn back
(counterclockwise) to the desired time.
After setting the time, use a time signal to synchronize the watch by
pushing the crown to the normal position to start the second hand
going.
Note: Make sure you have correctly set a.m./p.m. before setting the
time. When the day changes over, it is a.m. (The day changes over
between 12:00 a.m. and 5:30 a.m. or a little later) check a.m./p.m.
by the 24 hour hand.
Setting the Date (By Quick Operation)
Pull the crown out to position 2. Turn the crown counterclockwise to
set the date quickly.
Note: Do not set the date between 9:00 p.m. and 12:30 a.m. The
date may not change correctly the next day.
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