Compass Flashcards
What is the value of mag dip in the south pole
90°
What do the following indicate:
1-an agonic line
2-an isoclinic line
3-an isogonic line
1-zero variation
2-equal dip
3-equal variation
When is the magnetic compass most effective
Around Midway between the magnetic poles
What is the value of magnetic dip at the magnetic equator
Zero
What is the max value of dip angle
90°
When is the annunciator of a remote compass indicator used
When synchronizing the magnetic and gyro compass elements
On what heading is the compass calibration done to determine deviation
On any heading
Are there acceleration/deceleration errors on the magnetic equator
No
What does the direction of magnetic north coincide with at a certain position
The horizontal component of the Earth’s magnetic field
How is a direction reading magnetic compass made aperiodic (dead beat)
By keeping the magnetic assembly mass close to the compass point and by using damping wires
When are turning errors greatest
At high latitudes
What is the main advantage of a Remote Indicating Compass compared to a Direct Reading Compass
It senses, rather than seeks, the magnetic meridian
What is the difference between hard and soft iron magnetism
Hard - permanent
Soft - non permanent
How is deviation in an RMI reduced
By mounting the flux valve in the wingtip
