Quote:
Originally Posted by Mittelwaechter
Edit: I checked your screenshots.
How comes A2 is smaller than A1?
Have a look at your 2.3 circle to add "s" - does it match the criterias? Does the second bearing cut the courseDIRECTION into two equal parts between first and third bearing? It should be a hint something is wrong.
Assuming A1 and A2 are correct - you made a mistake at the auxillary drawing.
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The AOB is 11° - not 37°.
The 'side' you choose for the auxillary drawing is not important. I mentioned it in the Konrad story but it is not necessary to care for.
For an incoming contact the AOB must be smaller than 90° (in SH3 smaller than 60° !!)
Is your U-Boot at full stop for the first three bearings? Do you stop for the crossbearing? Try to mark the point of the crossbearing.
Draw the 20 km bearings from the outside/the circleline onto your boat and move them like I did it in the tutorial. Remeber the bearing is a "cone" of 350 meters width on the hydrophonecircle. Try to center the bearingline to minimize error.
Try to work as exact as possible to counter the inaccuracy of the SH3 maptools.
Let's call it a day!
Regards
Mittelwaechter
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I'm sorry Mittelwaechter, but I think you are wrong. You seem to have switched the bearing differences around. Based on the bearings that Bojan provided (B1=294, B2=298, B3=301) I believe it must be moving away. See that the 2nd bearing difference (between B2 and B3) is only 3 degrees, and the first bearing difference (B1 to B2) is 4 degrees. If the bearingdrift slows down (less degrees in the same time) then it (must) means that the target is moving away, and therefore have an AOB bigger than 90 degrees. As the target closes the change in bearing speeds up until it has an AOB of 90 degrees, but as it moves further and away is slows down again until it a crawl. But just one degree of slowdown in drift is not enough to make a good judgement because it could have resulted from rounding off the numbers that the crew does. I really advise to take more time than 9 minutes in this case to make the differences diverge more. Especially if you (Bojan) are trying to learn this.
According to the formula that I based my tool on (I've mentioned it in other thread so I won't repeat it here unless Bojan is curious
), the AOB should be 153 degrees based on the first 4, then 3 degrees of bearingdrift. Bojan mentioned the target must have had an AOB of 26. I can only make sense of that together with the bearings given, if he looked at the 'angle on the stern' instead of the 'angle on the bw'. Because it looks just like it. (153=180-27)