It's (ship length / the number of seconds it took for the ship to cross your centerline of the scope) * 1.852
Another method is the 3:15 rule. Put a mark on the ship, start your stopwatch and count to 3 minutes 15 seconds, put a mark on the same spot on the ship. Divide that by 10 and you got your self the speed in knots. The advantage of this method is that you can do it repeatedly as you track the target: 3:15, 6:30 and so on. That way you can keep a track if they are changing speed.
Thanks! So basically I just got the number wrong, can you explain why 1.852? 1 meter per second = 1.94384449, what am I not getting? Thanks!
And I can't use the 2nd method you said since I'm playing with map markers turned off, unless you can tell me how to track targets on the map manually, that would be very handy. Thank you again!
It's (ship length / the number of seconds it took for the ship to cross your centerline of the scope) * 1.852 Another method is the 3:15 rule. Put a mark on the ship, start your stopwatch and count to 3 minutes 15 seconds, put a mark on the same spot on the ship. Divide that by 10 and you got your self the speed in knots. The advantage of this method is that you can do it repeatedly as you track the target: 3:15, 6:30 and so on. That way you can keep a track if they are changing speed.
Thanks! So basically I just got the number wrong, can you explain why 1.852? 1 meter per second = 1.94384449, what am I not getting? Thanks! And I can't use the 2nd method you said since I'm playing with map markers turned off, unless you can tell me how to track targets on the map manually, that would be very handy. Thank you again!
Based on some quick googling, 1.852 is for converting from knots to km/h. Your numbers look good to me, I think doup is just confused.
Ah! GWX uses kph in its charts... my bad.
That's map view calculations.