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bojan811 · 08-02-09, 04:48 PM

Q:How to calcualte the contacts speed.

Tutorial formula was some thing like this...
60min :9min (used time to mesure the beringlines)=6.66

then 6.66X traveled distance in between beringlines =X metars

and X metars : 1852= speed

Should I use the same calculation with the ecseption of 9 min because I used 6 for my calculation.

Ok its bad weather again and I practise.

Contact sound on 294 b , start the clock and put `st bering line, 2nd afther 9 min (298bering) so the P1 - M=86 and 3rd bering line was on 301 afther 9 min so the P2-M=87.

I draw the c1 and c2 and got the Uboat intersection but it was on the right (not the left) side.

So I mesured 2 angles one was 37 from right to left and the other was 135 i think form right to right.
So I used the 37 angle and draw a courseline , then I added the 4 br line, and ploted the real curse.
When I mesured I got the distance to the target about 11Km but the actual distance was less than 8 km. And target AOB was 26 degree, not 37 and not 135.

This picture is showing the actual position of the tareget and you can see the 37 degree course based on hidrophones reports

08-02-09, 04:48 PM	#13
bojan811 Engineer Join Date: Jul 2009 Posts: 207 Downloads: 106 Uploads: 0	Q:How to calcualte the contacts speed. Tutorial formula was some thing like this... 60min :9min (used time to mesure the beringlines)=6.66 then 6.66X traveled distance in between beringlines =X metars and X metars : 1852= speed Should I use the same calculation with the ecseption of 9 min because I used 6 for my calculation. Ok its bad weather again and I practise. Contact sound on 294 b , start the clock and put `st bering line, 2nd afther 9 min (298bering) so the P1 - M=86 and 3rd bering line was on 301 afther 9 min so the P2-M=87. I draw the c1 and c2 and got the Uboat intersection but it was on the right (not the left) side. So I mesured 2 angles one was 37 from right to left and the other was 135 i think form right to right. So I used the 37 angle and draw a courseline , then I added the 4 br line, and ploted the real curse. When I mesured I got the distance to the target about 11Km but the actual distance was less than 8 km. And target AOB was 26 degree, not 37 and not 135. This picture is showing the actual position of the tareget and you can see the 37 degree course based on hidrophones reports Last edited by bojan811; 08-02-09 at 05:50 PM.