Direct Reading Compass

Question 1

Properties of DRC

Answer 1

HAS

Horizontality Aperiodicity Sensitivity

Question 2

What is Horizontality

Answer 2

The ability of compass to align with the horizontal component of earth’s magnetic field

Question 3

What is Aperiodicity

Answer 3

Measure of how quickly the magnet settles down

Question 4

Errors of DRC

Answer 4

acceleration, turning & turbulence

Question 5

When are acceleration errors max in DRC

Answer 5

When accelerating E or W

Question 6

When are turning error max in DRC

Answer 6

When turning through N or S

Question 7

Greatest cause of error in DRC

Answer 7

Turning

Question 8

Where is magnet assembly suspended from? (to improve horizontality

Answer 8

above the CG

Question 9

What can a DRMC be affected by?

Answer 9

Hard iron

Soft Iron affects hard iron and hard iron affects compass