Gyro and Magnetic Compass - Naval Academy

# Gyro and Magnetic Compass - Naval Academy - NN101 Gyro and...

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NN101 - Gyro and Magnetic Compass

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Enabling Objectives 1. Know the advantages, disadvantages and applications of gyro and magnetic compasses 2. Know the causes of gyro error and how to determine if error exists 3. Know how to calculate gyro error 4. Know the causes of Variation and Deviation 5. Apply Variation to convert between degrees True and Magnetic 6. Know how to interpolate from the Deviation Table 7. Know how to convert True to Compass and vice versa 8. Know the methods used to take bearings in the event of gyro failure Reference : Dutton’s Nautical Navigation, 15 th edition, chapter 7
Gyro Compass A North-seeking gyroscope - “ A spinning wheel which is held by two gimbals electronically stabilized ”. The gyroscope has three axes of angular freedom : - Spin axis - Horizontal axis - Vertical axis Advantage : Aligns to True North vice Magnetic North and will not change due to magnetic variation Disadvantage : Will lose its orientation as the Earth rotates unless torque is applied opposite rotation.

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Shipboard Use There are usually two gyros which are placed deep in the ship on the centerline: Master - oriented to north/south,used for navigation & shiphandling. Back up - oriented east/west, used for combat systems. Bridge - Three important pieces of equipment: 1) Centerline Pelorus 2&3) Bridgewing repeaters (port and starboard)
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• Spring '14
• Compass, degaussing, Centerline Pelorus, gyro error, Conning Officer

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