MARINE NAVIGATION-AMPLITUDE/AZIMUTHS?

[irishlad8877]

IM STUCK WHEN TO ADD/SUBTRACT FOR DEVIATION WHEN ITS W/E<br />
TRUEBRG067.8<br />
COMPASSBRGING068.0<br />
C/E0.2W-ERROR W COMPASS BEST!!<br />
VAR5.0E<br />
DEV?????<br />
COMPASS ERROR0.2W<br />
<br />
HOW DO I CALCULATE DEV WHEN E/W,WHEN TO ADD/SUBTRACT????<br />

 

[Serapis80]

Write the following from left to right C D M V T

Memorize the saying "Can Dead Men Vote Twice At Elections?"
C is compass bearing, D is deviation, M is magnetic bearing, V is variation, and T is true bearing. When you write the various components in this order, you Add East as you go from left to right.

Fill in the given information, in this problem, C V and T are known. First figure out M. Since V is 5.0E and T is 067.8, and you are adding easterly quantities as you go right, M must be 062.8 (or 067.8 - 5.0). Now, the difference between C and M is 5.2, and you assign the direction West to it because that follows the rule of adding easterly quantities and subtracting westerly quantities as you move right.

 

[markt]

when going from true to compass add westerly variation/deviation and subtract easterly. remember
east is least(subtract) and west is best (add)