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Originally Posted by MaHuJa
There is *one* place where you get the actual sensor bearing rate - the ffg towed array. The rest you'll have to average by time, as said earlier here.
That said, I somehow fail to see how this would not be redundant to the job done at the tma board...
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I don't want the derivative of the bearing with respect to time. I actually WANT the time averaged bearing rate. That's how Ekelund ranging works. It's a way of estimating things based on it. They also calculate the bearing rate and display it on the navigation screen for all platforms. That being said, because I don't like how it calculates it, sometimes it's easier to just do it myself. It's usually more correct.
Sometimes trying to do these things graphically is more confusing and less accurate than just plugging the numbers in and getting the answer. Then, I use the numbers I calculate at the sonar station to inform the picture I paint at the TMA station. It's all about having more information.
One of the things I actually like about the FFG is that it gives you a lot of useful numbers that otherwise I'd have to calculate, like CPA distance.