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razark · 11-26-23, 09:30 PM

Isn't it supposed to be 3:15 for metric?

(900 meters) / ((3 minutes) + (15 seconds)) = 8.97158997 knots

(100 meters) / ((3 minutes) + (15 seconds)) = 0.996843329 knots

A ship travels (approximately) 100 meters per knot in 3 minutes 15 seconds.
So, mark the position of the target, start the stopwatch. When it reaches 3:15, mark the position again. Measure the distance, divide by 100, and the answer is the speed in knots, reasonably close enough to get a hit. 900 meters, 9 knots. 850 meters, 850 knots. 2100 meters, 21 knots. You never need to divide by seconds or minutes.

For imperial, it's 100 yards per knot in 3 minutes.

(100 yards) / (3 minutes) = 0.987473002 knots

11-26-23, 09:30 PM	#6
razark Ocean Warrior Join Date: Mar 2007 Location: Houston, TX Posts: 2,731 Downloads: 393 Uploads: 12	Isn't it supposed to be 3:15 for metric? (900 meters) / ((3 minutes) + (15 seconds)) = 8.97158997 knots (100 meters) / ((3 minutes) + (15 seconds)) = 0.996843329 knots A ship travels (approximately) 100 meters per knot in 3 minutes 15 seconds. So, mark the position of the target, start the stopwatch. When it reaches 3:15, mark the position again. Measure the distance, divide by 100, and the answer is the speed in knots, reasonably close enough to get a hit. 900 meters, 9 knots. 850 meters, 850 knots. 2100 meters, 21 knots. You never need to divide by seconds or minutes. For imperial, it's 100 yards per knot in 3 minutes. (100 yards) / (3 minutes) = 0.987473002 knots __________________ "Never ask a World War II history buff for a 'final solution' to your problem!"