CITIZEN H461 - Manual (Page 33)

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A. Navigation Calculator
1. Calculation of time required
Question: How long does it take an airplane flying at 180 knots to fly a distance of
450 nautical miles?
Solution: Set the 18 mark on the outside scale to the SPEED INDEX (Y). At this
time, the point on the inside scale that is aligned with 45 on the outside
scale indicates (2:30), and the answer is 2 hours and 30 minutes.
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13. Using the Slide Rule
Flying distance and other navigation
calculations as well as general
calculations can be performed using the
slide rule located around the outside of
the dial. This slide rule is not able to
display decimal places for calculation
results, and should only be used as a
general reference as an alternative to
more accurate calculations. Turning the
crown at the 8:00 position allows the
slide rule around the dial(Outside Scale)
to be rotated.
Inside scale
Outside scale
Crown for turning the outer scale