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Originally Posted by Neptunus Rex
Incorrect. Doppler shift is solely a function of speed (own ships and/or target)in the "line of sight". Distance is not a factor. A measurable doppler shift at 5000 yards will be the same at 50,000 or 500,000 etc.
And yes, I too wish it were modeled. It is an accurate way to determine if a contact is opening or closing, manuevering away/towards, increasing/decreasing speed. ("Conn, Sonar, Possible target zig, Master One!")
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To be a little pedantic doppler is a function of
relative speed when we are talking about target motion analysis. Actually, in any situation. A target does not have to increase its speed to display a doppler shift, as it can just turn toward or away from the sensor.
And doppler combined with relvel can give you a good firing solution in two updates (three minutes), and give you a very good appraisal of the situation after one ("TMA update!") - enough to send the helo out into a reasonable AOP and give the sub something to think about. The strip plotting used in the game is not the primary method of doing it - it's a check, and a good one, but it takes too long.
And again I'll reiterate what has been said, doppler is modelled in the game, but the displays we are given makes it not worthwhile to use, outside of fast moving/close range contacts like torps circling sonobuoys (up doppler pointer 03, down doppler pointer 07, CPA pointer 12. Whoopeee). That's OK, it wouldn't be useful to too many people and double the size of the manual.