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Originally Posted by USNSRCaseySmith
The smaller circles would have made it so my circles wouldnt have converged and the way I know how to do it I need to have them converge before I can get an angle to lead the target with. and Could you maybe visually represent what you told me? I dont understand the 25 km/knot thing..
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Originally Posted by USNSRCaseySmith
Then I draw a circle representative of his speed (slow is 6knots so well use that) then where that circle intersects his course I draw one rep of my speed. (say hes doing 6 knots and I feel like doing 7 or 8 so I draw a 8 km circle) then I draw an angle where my circle meets the 1st leg of the "Big angle" then I make the Big angle match the little angle and i have my interception.
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I'm sorry, I can't think of a way to make it more visually clear. But you allready understand what I meant I think. In the bold text above you took a scale of 1km om the map to represent 1 knot of speed. But if you actually draw that then it becomes a teensy weensy drawing. Better to make it a bit bigger, that's all. If you make his speed larger by for example 10 times, then you should make your own speed circle also larger by 10 times to keep the shape. But you are right, it should not become larger than the distance to the target is now. Then your speed circle might converge with the line from target to sub
behind your sub. It's still geometrically correct, but confusing for the eye.
By the way, it is not garuanteed that you can make the intercept. The 'Angle on the bow' might be too large (depends on the position of you both), or your speed is too slow, to ever make the intercept work. If this is the case then your speed circle wouldn't even touch the line from the target to your sub. You have to find a way to go faster or give up. Can't have everything.
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as well as in GWX on the right side of the Nav map there are scales how are they used??
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The scales on the side of the (GWX) map are known as a 'nomograph'. It allows you to calculate speed=distance/time equations. You have to know atleast 2 out of the 3 values. Like speed and time with distance unknown. Then you can figure out how far you move after such time at that speed. Or time is unknown then you have to know speed and distance. But it really doesn't matter which one of the 3 is unknown, and which 2 are known. You'll solve it at the blink of an eye.
To do so, pick the line tool. Draw a line across all three scales. It wil be diagonal most likely. Place the endpoints such, that the 2 known values are crossed by the line. You will find that the unknown value is also crossed by the line. Now grab your calculator and check!
Here is an example of a nomograph on it's side:
It shows:
top scale: time (minutes= 1)
middle scale: distance (0.8-ish kilometers)
lower scale : speed (25 knots)
25 knots is 46.3 kilometers per hour. In one minute that is 46.3/60= 0.77 kilometers.