Quote:
Originally Posted by ddrgn
Relative Target Bearing or True Target Bearing (TTB) is relative to true North.
So if your Targets bearing via your scope is 45 degrees and your course is 350 degrees his TTB is 35 degrees. In this case lets say his course is 225 degrees
When you see him on the left side of your scope at 350 degrees you do the math like this:
225 - 35 - 180 = 10 degrees AOB
If his TTB is 15 degrees and his course is 300 then like this:
300 + 15 - 180 = 135 degrees
You either add or subtract depending on which side of your boat he is on.
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Aw Thanks Mate
So just to confirm -
1) I should be marking his postion on map with True Bearing calculations (To North) So therefore I will get his True bearing when I use ruler to join the marks (Good -This is what I have done in past)
True Bearing = My Course + Scope Bearing (target)*
*If over 360 then minus 180 to final calculation.
2) If Sub is on the targets port side (Left) then (TTB+ (plus) RB-180 = AOB)
-or-
If Sub is on the targets starboard (Right) then (TTB - minus) RB-180 = AOB)
3) I also assume that if you alter course then you must recalculate the whole solution?
Correct?
Thanks so much for this as it will really save me so much time - No more AOB wheels etc 