COMPASS


1.


Calculate the variation for 2017 at the following locations: a) Off the coast of Maine


b) Possession Sound c) Fort Lauderdale d) Pavlof Bay


e) Boothbay Harbour 2.


Variation 2011: 17°30´W Annual change


(7´E)


Variation 2009: 17°15´E Annual change (11´W) Variation 2014: 6°30´W Annual change


(6´W)


Variation 2014: 12°30´E Annual change (12´W) Variation 2012: 16°00´W Annual change


(5´E)


Using the corrected variation from Question 1 (rounded off to the nearest degree) calculate the true bearing for each of the following:.


a) Off the coast of Maine b) Possession Sound c) Fort Lauderdale d) Pavlof Bay


e) Boothbay Harbour 3.


035°(M) 270°(M) 350°(M) 020°(M) 010°(M)


Using the corrected variation from Question 1 (rounded off to the nearest degree). Calculate the magnetic bearing for each of the following:.


a) Off the coast of Maine b) Possession Sound c) Fort Lauderdale d) Pavlof Bay


e) Boothbay Harbour 4. 5.


305°(T) 180°(T) 060°(T) 135°(T) 355°(T)


Give three causes of deviation commonly found on board.


Convert the following compass courses to True. Use the variation indicated and the deviation table in the Training Almanac.


a) Course 340°(C) Variation 10°W b) Course 070°(C) Variation 3°E c) Course 290°(C) Variation 6°W d) Course 010°(C) Variation 14°E e) Course 190°(C) Variation 12°W


6. 7. Give an explanation of ‘dip’ error.


Excluding deviation, give three compass errors that you may encounter and explain how you could compensate for them.


9


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