the magnetic compass - sailcork.com skipper classes/compass... · 2 the magnetic compass ! compass...
Post on 24-Feb-2018
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1
The Magnetic Compass
! Floating Pin ! Marine-
floating card ! Binnacle
Mounted ! Hand bearing
2
The Magnetic Compass ! Compass
card with points of the compass - used in the past
! Today we usually use 360 degree compass
3
The Steering Compass
! Binnacle or dash mounted
! Bulkhead mounted
4
The Hand Bearing Compass ! Take bearings from
companionway (yacht) or wheelhouse
! Use charted obvious targets
! Good angle between bearings
! Bearing on beam last
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5
The Electronic Compass ! Aslo called
fluxgate ! Main use: ! Hand bearing ! Autopilot
6
Compass Error - Variation
Caused by Earth’s magnetism
! Varies from place to place
! See compass rose on chart
! Must be updated
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Compass Error - Variation
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Compass Error - Variation
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Compass Error - Deviation ! Caused by
boat’s magnetism
! Metallic objects ! Speakers ! Find difference
(from GPS) ! Make a
deviation card
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Compass Error - Deviation
! Boat’s magnetism
! Metallic objects
! Deviation card
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Compass Correction
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Compass Correction
Compass Cadburys Deviation Dairy
Magnetic Milk
Variation Very
True Tasty CADET When going from compass to true add east
E+ W-
090 C + 6 E 096 M - 8 W 088 T
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