Calculating ships speed

keith_uk · 03-17-09, 11:18 AM

To calculate a ships speed, i place a mark on the map where the ship is, then set the stop watch going for one minute or more, then mark its position again.
I then measure the distance in yards the ship covered divided by the number of minutes its taken X 60 (seconds) =, then divide that figure by 1760 (which is how many yards are in a mile and that gives me the speed in mph.

Is there a way to calculate the speed in knots? I was wondering if a few seconds less than 60 seconds might work? if so, how many seconds?

Thanks,

Keith.

AVGWarhawk · 03-17-09, 12:04 PM

Mark the ships position on the map. Set the stop watch for 3 minutes. At 3 minutes make the second mark of the ships postion. Use the compass from mark 1 to mark 2. If it is 1000 yards it would equal 10 kts. 700 yards is 7 kts. etc.

03-17-09, 11:18 AM	#1
keith_uk Torpedoman Join Date: Apr 2008 Posts: 114 Downloads: 101 Uploads: 0	Calculating ships speed To calculate a ships speed, i place a mark on the map where the ship is, then set the stop watch going for one minute or more, then mark its position again. I then measure the distance in yards the ship covered divided by the number of minutes its taken X 60 (seconds) =, then divide that figure by 1760 (which is how many yards are in a mile and that gives me the speed in mph. Is there a way to calculate the speed in knots? I was wondering if a few seconds less than 60 seconds might work? if so, how many seconds? Thanks, Keith. __________________ i7-3930k CPU 16GB RAM GeForce GTX 670 Samsung SSD 830 Series Windows 7 Ultimate 64-bit

03-17-09, 12:04 PM	#2
AVGWarhawk Lucky Jack Join Date: Jun 2005 Location: In a 1954 Buick. Posts: 28,286 Downloads: 90 Uploads: 0	Mark the ships position on the map. Set the stop watch for 3 minutes. At 3 minutes make the second mark of the ships postion. Use the compass from mark 1 to mark 2. If it is 1000 yards it would equal 10 kts. 700 yards is 7 kts. etc. __________________ “You're painfully alive in a drugged and dying culture.” ― Richard Yates, Revolutionary Road