Quote:
Originally Posted by Magnum
Makman, can you explain me what vent wrong in this case:
The blue line should be the correct bearing of the target acording to this method, but somehow. the red line was the true bearing. Somethimes this method work, but somethimes.. is just wrong and I can't figure out why. The time interval between bearing measurement is 10 minutes. I just can't explain how come the final path was exactly the opposite to the calculated one.
Can you mod your nav map tools to be available for sh5 too? I so miss some pro tools for drawing on map.. right now I do my math on paper, it realistic but also annoying :/
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hi Magnum,
at your pic is showing that you are using the method with the stopped u-boat .
you have made a lot of mistakes and also your drawings are not accurate (accuracy at drawings is a critical part ) and seem very ''fast made''.remember, with methods like this one...you have to be patient .
before i start telling you the mistakes ,have in mind that bearings a ,b , c and the last one (the one from point A2 )must be very accurate (the more accurate they are ...the more accurate your solution will be)
first, the point G must be in the middle of A1P1 and at your pic it is not .
second , the line Gg must be parallel to bearing c and at your pic it is not (yea ,i know that it seem to be so but if you look closer it is not )
these two mistakes are leading you to the next mistake which is that P1P2 is not equal to P2P3 .these two must be equal in order to proceed so you should have stop here.the procedure have allready failed.
all these ,plus the possible not accurate bearings a,b,c (don't be based on your SO ,use the sonar bearing lines) are giving you the wrong result.
next mistake is that the point P4 is not placed correctly . the P4 must be placed on the extension of line P1P3 that way so P1P2=P2P3=P3P4 .once you find the point P4 then you draw the ''bearing'' that is ''passing'' from it.
In my opinion,an easier way to find the point P4 (with the availiable tools we have at sh) is showing at my video.at video,the situation is for a moving u-boat but pay attention at the way i am finding the first point of ''red line'' there.
you can use the same way at your situation to find the point P4.(watch carefully the video at the part of finding the first point of red line and if you don't get it...ask me again to explain)
WARNING: DON'T ERASE THE CIRCLE THAT IS POINTED TO YOU the point P4 !! ITS RADIUS IS pointing ,also, to TARGET'S COURSE (at the situation of stopped u-boat)!! this tip will help you to draw the exact course of target once you find his exact position.
ps: i think that sh5 has allready ALL the tools(and Abd_von_Mumit gave you a mod with better graphics) exept a working ruler for measuring accurate the distances and,afaik, can't be modded at sh4 or sh5( the major issue that kept me away from sh4 and sh5--at sh5 the things are even worst with the map! )
HTH,
bye