Citizen C70 Instruction Manual page 20

<Using bezel-2>
The yacht can sail in the windward direction
at an angle of 45° (high performance yacht
can sail 40°). If the yacht is sailed in the
windward direction before race and the
obtained angle at the red or green mark
(upper right or upper left) is set, the wind
shift can be read during the race.
Therefore, the yacht can be sailed in the
most favorable direction.
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<Using bezel-3>
The bezel can be used to find the angle of the
Wind
start line to the wind direction. The start line is
generally set to the wind at an angle of 90°.
However, it seldom is the real right angle
because the wind direction changes frequently.
Therefore, set the white \ mark in the wind
direction and sail in the direction from one end to
the other. If the sailing direction is in positive side
of the white line of the 3-hours (or 9-hours) point,
it is advantageous to set sail close to the current
direction. If the current direction is in negative
side of the white line, it is advantageous to take a
course opposite to the mark.
* Making full use of the three functions enables you to sail in the most favorable
course.
Direction of wind
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