There is a formula in there, and it's very fundamental to TMA.
What if it wasn't bearing rate you were trying to figure out, but was something else, like....range?
This is the first thing they taught me in the TMA part of my school. It's the inverse relationship between bearing rate and range, and understanding everything else hinges on this.
When you combine ekelund ranging or tri-ranging with this formula and a best estimate of speed, you will know speed across the line of sight and course. Who needs a fire control system when you can look at the sonar display and do it all in your head?
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