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Originally Posted by Fish40
I actually got my first kill the other day useing the DO method! RR great tutorial by the way  I got a radar contact at 10nm. I slowed to 1/3 speed and began my first plot. Three minutes later I took another reading and plotted. After determining his course, I got in position 90 degrees to his track and set up the TDC as per the tutorial.
The one thing I have a problem with is getting an acurate speed, which is essential with this method. Since the Radar screen dosn't have range rings, it's hard to determine exact distance between the two plot points, so therefor measuring the distance between the two points will yeild an inaccurate figure. I actually find it a challange to aquire a visual, get an ID, and measure the time it takes for the target to cross the 0 bearing line to determine speed.
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It seems to me, once you have an accurate speed, the rest is sinfully easy! |
Why are you trying to measure speed on the radar scope anyway?
In your first paragraph you mention that you have acquired the target at 10nm and you plot two points to determine true course (presumably on the navmap). Once you have the TC plotted you should be setting yourself up for a submerged attack on a 90° beam to the target TC.
As you make your submerged approach, the hydrophone operator will call out bearings to the target that you can plot on the TC line. If your TC plot is good, the distance between those points should be plenty accurate enough for a good speed calc.