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12-09-12, 04:26 AM

With the 3:15 method you can count out very accurately the speed and heading of the target. It's quite simple.
The speed of a ship in knots equals with the distance she travels in km multiplied by 10. E.g. When you sight the target, mark her position on the map and start your chronometer. At 3 min 15 sec mark the target's position again and measure the distance between the first and the second marking. If it reads 0.9 km, multiply it by 10 and you'll get 9 knots, i.e. the speed of the target. If you connect the markings with a line, you'll also get the direction of the target.

12-09-12, 04:26 AM	#2
allievo Stowaway Posts: n/a Downloads: Uploads:	With the 3:15 method you can count out very accurately the speed and heading of the target. It's quite simple. The speed of a ship in knots equals with the distance she travels in km multiplied by 10. E.g. When you sight the target, mark her position on the map and start your chronometer. At 3 min 15 sec mark the target's position again and measure the distance between the first and the second marking. If it reads 0.9 km, multiply it by 10 and you'll get 9 knots, i.e. the speed of the target. If you connect the markings with a line, you'll also get the direction of the target.