Compass System

Compass System

Given a Navigation Data Sheet and data, COMPLETE a Navigation Data Sheet after correcting for errors IAW references.

What we plan to do

REVIEW the strengths and limitations of magnetic & gyrocompasses

DEFINE variation

DETERMINE variation

DEFINE deviation

DETERMINE deviation

DEFINE gyrocompass error

Find out!

• How long humans have been using the Earth's magnetic poles for nautical navigation.

• Who was the first to use it.

Open Ended

List 5 advantages of a magnetic compass.

Open Ended

List 3 disadvantages of the magnetic compass.

Poll

The difference between true and magnetic north can be determined

• It can be determined and it is called variation

• It cannot be determined because magnetic north is always moving

• It can be determined and it is called deviation

• It cannot be determined because of the gravitational pull of the moon

Poll

How is variation displayed on a Compass Rose within a nautical chart?

• East

• West

• East and West

• East or West

Open Ended

Explain the annual increase in variation, what does it mean?

Open Ended

If a nautical chart displays a variation of 10° 45’ W with an annual increase of 5’ in 2015, what would the variation be in 2021?