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Originally Posted by Mush Martin
...or do you mean to determine speed?
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No, I (attempt to) determne course and speed. If I hear a ship on hydrophone (these are pre-sonar rangefinder days) I know only its bearing, although an
estimate of speed can be made by listening to propeller revolutions using raduz's sound charts and hydrophone mod. However, I have no idea about direction of travel.
Therefore, I mark circles of various circumferences to match distance travelled in 10/20/30/60min (depending upon distance - guessed/judged by clarity of hydrophone sound) and then wait that long and recheck the bearing. By intersecting the bearing with the circles I've drawn, I've an estimate of the target's course and minimum speed and can plot an intercept accordingly.
I ask specifically for counting propeller revolutions, as I usually overestimate the rpm. I'm thinking ths may be because 1 minute in the game isn't necessarily the same as 1 minute on my watch. Hence the question about the on-screen stopwatch.
@Nemo: I presume you acquire your target's speed from listening to prop rpms too - if you use another method, I'd be grateful if you'd tell me about it! In fact, if anyone else uses another method for determining speeds of other ships accurately, please help me out.