Quote:
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Originally Posted by geosub1978
Quote:
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Originally Posted by flag4
hi hunters
could someone please explain 'course relative to bearing' 
if a ship is spotted at 301 degrees, what is the bearing relative to me ?
im watching olc's tutorial and trying to understand the bit where he is plotting the course of the ship, and, he says its 59 degrees relative to his course.
ive treid to work this out on my own and it doesnt add up, coz i know something happens when a ship is moving away from, like, subtracting the 301 from 360 which gives 59. and yet this doent always seem to work.
ive tried it with numerous different courses and i can not get the maths to work - and i have to say its driving me nuts: is there a formula for this ?
ie; when a ship is coming to me and when a ship is moving away.
im very confused...
thanks |
OK! Let's begin with coarse
Let's say your coarse is 125. This means you are 125 degrees right from 000 degrees which ALWAYS points NORTH!. This is your TRUE coarse.
If a target is 25 degrees LEFT from your coarse this means that target's TRUE bearing is 125-25= 100 degrees. So, 100 is target's TRUE bearing.
If a target is 25 degrees RIGHT from your coarse this means that target's TRUE bearing is 125+25=150. So, 150 is target's TRUE bearing.
However, if you regard that the direction that you bow points is 000 (nomatter what TRUE coarse is), this is regarded as your RELATIVE coarse. Then, if a target is 25 degrees LEFT from you bow, this means that target's RELATIVE bearing is 25 degrees LEFT. If the target is 25 degrees RIGHT from your bow, this means that target's RELATIVE bearing is 25 degrees RIGHT.
That' all! |
now wait a minute, this is
begining to make sense, the left and right stuff + and -, this is where im going wrong; so, what happens if the ship is heading away from me ? does left and right still apply