Yacht Navigation

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Section 4.8

20211127_143925.jpg


IMG_20211204_184121.jpg


You say?
 
REMEMBER: Bearings are always measured clockwise from North and are given as 3 digits.

examples:
s3eg1.gif
If you walk from O in the direction shown by the red arrow, you are walking on a bearing of 110 °.

s3eg2.gif


Note that the first two bearings above are in directly opposite directions to each other.
They have different bearings, but they are exactly 180° apart as they are in opposite directions.
A line in the opposite direction to the third bearing above would have a bearing of 150° because 330° - 180° = 150°.
 
Example 2
A ship sails from A to B on a bearing of 120°.
s3eg4a.gif

On what bearing will it have to sail to return from B to A?

We can extend the line from A to B, then rotate through 180° to head in the opposite direction.
s3eg4b.gif


We can see from the diagram above that the bearing from B to A is 300°, because 120° + 180° = 300°.

REMEMBER: Bearings in exactly opposite directions are called back bearings and are always 180° apart.
 
Example 2
A ship sails from A to B on a bearing of 120°.
s3eg4a.gif

On what bearing will it have to sail to return from B to A?

We can extend the line from A to B, then rotate through 180° to head in the opposite direction.
s3eg4b.gif


We can see from the diagram above that the bearing from B to A is 300°, because 120° + 180° = 300°.

REMEMBER: Bearings in exactly opposite directions are called back bearings and are always 180° apart.

Amazing as always. Great drawings. Thanks.
 

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