The following examples serve as a guide of how to use the slide rule.
SPEED CALCULATION:
What speed is required to go 10 nautical miles in 15 minutes?
Known Factors: Distance: 10 nautical miles Time: 15 minutes
•Align “10” arrow on the outer ring with “15” on the inner ring.
•The speed required can be found directly above the
“MPH” marking on the inner ring
The answer: 40 nautical miles per hour
Time Calculation: How long will it take to go 10 nauti- cal miles at a speed of 40 miles per hour?
Known Factors: Speed: 40 miles per hour Distance: 10 nautical miles
•Align “40” on the outer ring with the mark “MPH” marking on the inner ring.
•The time required can be found directly below the “10” arrow on the outer ring, which is “15” on the inner ring.
The answer: 15 minutes
DISTANCE CALCULATION:
How far can you travel at 40 miles per hour for 15 minutes?
Known Factors: Speed: 40 nautical miles per hour Time: 15 minutes
•Align “40” on the outer ring directly above the mark
“MPH” on the inner ring.
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