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Originally Posted by Pisces
1 knot is 0.5144 m/s (=1852m/3600s). Then 100meters take : 100/0.5144=194.4 seconds. That's 3m14.4s, but 3m15s is easier to use quickly.
As for the original 3-minute rule: 1 nautical mile is usually rounded off to 2000 yards ( Wiki says it actually is 2025.372 yards) So 1 knot is 0.5555 yards/second (=2000yds/3600s) Then 100yds take 180 seconds, which is 3 minutes. Since the exact 2025.372 yards case leads to a time of 2m58s for every 100 yards movements you can use 3 minutes as a good approximation.
The 15-odd seconds difference is because a yard is not equal to a meter. |
Hi!
I'll update the manual section with a bit more detail on why we suggested 3 min 15 sec: it's basically for the reason you've given.
Pablo
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