Direct Reading Compass Flashcards
1
Q
Properties of DRC
A
HAS
Horizontality Aperiodicity Sensitivity
2
Q
What is Horizontality
A
The ability of compass to align with the horizontal component of earth’s magnetic field
3
Q
What is Aperiodicity
A
Measure of how quickly the magnet settles down
4
Q
Errors of DRC
A
acceleration, turning & turbulence
5
Q
When are acceleration errors max in DRC
A
When accelerating E or W
6
Q
When are turning error max in DRC
A
When turning through N or S
7
Q
Greatest cause of error in DRC
A
Turning
8
Q
Where is magnet assembly suspended from? (to improve horizontality
A
above the CG
9
Q
What can a DRMC be affected by?
A
Hard iron
Soft Iron affects hard iron and hard iron affects compass
