Coefficient A Rods
B and D Rods
A acts on all headings
b A d, Bad because this coefficient has max deviation on all headings and is caused by human, physical error or assymetrics all are bad
It Rhymes
Coefficient B Force and Rods
Force P, C rod
You know its P, so BPC radio two
acts fore and aft
Coefficient C Force and Rod
Force Q, F rod
QFC
Acts Athwartships
Coefficient D Rods
A and E Rods
Coefficient D A and E - sing it
Acts on intercardinals
Coefficient E rods
B and D rods
bEd
Coefficient B runs
Fore and Aft
Coefficient C runs
Athwartships
Deviation Equation
A + Bsinθ + Ccosθ + Dsin2θ + Ecos2θ
θ=compass heading