Deviation - Easterly or Westerly
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Join Date: Jun 2010
Location: Salians, USA
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Deviation - Easterly or Westerly
Total Deviation on Heading = A + B Sin (@) + C Sin (@)
Now how to decide if this total deviation is Easterly or Westerly
Now how to decide if this total deviation is Easterly or Westerly
Join Date: Aug 1999
Location: England
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Well, I presume the @ symbol means heading.
First, lets get the formula correct. IIRC there should be a Cosine term in there for coefficient C rather than sine.
Now... how do you know if its East or West? Easy. The formula will spit out a positive or a negative number: (A B and C can all be negative or positive and sin and cosine generate numebrs between -1 and +1.
If its positive the deviation is East, if its negative the deviation is west.
In fact, why even bother if its east or west:
Compass + Deviation = Magnetic
So forget about all that 'east is least, west is best' clap trap and just keep it as a positive or negative number and you are good to go.
pb
First, lets get the formula correct. IIRC there should be a Cosine term in there for coefficient C rather than sine.
Now... how do you know if its East or West? Easy. The formula will spit out a positive or a negative number: (A B and C can all be negative or positive and sin and cosine generate numebrs between -1 and +1.
If its positive the deviation is East, if its negative the deviation is west.
In fact, why even bother if its east or west:
Compass + Deviation = Magnetic
So forget about all that 'east is least, west is best' clap trap and just keep it as a positive or negative number and you are good to go.
pb
