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Originally Posted by Flamingboat
As an example I need help with my intercepts. I see a convoy moving at X speed at Y bearing. How can I calculate how long it will take to travel a certain distance so I can plot an intercept better? I need to be able to figure out how long it takes to travel a certain distance at certain speeds so I know if I will be fast enough or whatever to get at the target, ahead or behind. Whatever the case may be.
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I'll have a go at it ... please you guys let me know if I get something wrong.
The speed is in knots, nautical miles per hour. Let's call that S. The distance travelled we'll call D - if that's in nautical miles it will be a lot easier.
Time in hours is T.
Speed is the distance covered divided by the time it took to cover it, i.e. S = D / T
If I read you right you want the time it takes.
That'd be
T = D / S.
So to find the time it takes to travel some distance you take the distance in nautical miles and divide it by the speed in knots.
If you're using kilometers you can convert to nautical miles by dividing with 1.85 (1 nautical mile = 1.85 km if I'm not mistaken).