[Pillar]

Originally Posted by Pisces

All should bear in mind this tool assumes you are motionless during the first 3 bearings at a fixed time interval. It then projects a 4th bearing another time interval later based on constant target speed and course. During this interval you should leave the original listening location at haste to create as much distance as possible. The bearing from the new listening location should cross the projected 4th bearingline as perpendicular as possible to provide an accurate range figure. From that you can also extrapolate backwards the place where he was and figure out speed.

Unfortunately this is not easy to do with the tools that DW/SC provides. It has no ability to draw lines like you can in SHx. So you are forced to recreate it on paper or something like MoBo.

It might be usefull in taking ESM reading and deterine the course of the aircraft. Your submerged speed (probably surface speed also) is alot slower compared to the aircraft so it won't distort the result by assuming you are motionless. Up until now (I've known about this technique but I never thought about it in context with SC/DW) TMA on ESM bearings was quite difficult to do by hand. But probabely because you can't automate the bearing taking process. And turning for your 2nd leg just takes too long, and your speed is too insignificant to make an effect.

ty, gg

awesome post