magnetic compass erros & limitations

Question 1

what is DV MONA

Answer 1

Deviation
Variation

Magnetic dip
Oscillation
North/south turn errors
in northern hemisphere = UNOS
Acceleration errors
in northern hemisphere = ANDS

Question 2

what is deviation

Answer 2

the difference between INDICATED and ACTUAL heading

it’s caused by the magnetic fields from the metals in the plane itself

Question 3

what is magnetic dip

Answer 3

it is the tendency of a magnet to align itself with the lines of the magnetic field

like if ur on top at the jets pole, the magnet wants to point directly downwards

*more of a problem when getting closer to the poles as the lines become parallel and therefore the compass wants to be parallel to the

Question 4

what is magnetic variation

Answer 4

the difference between TRUE and MAGNETIC north

Question 5

what is UNOS

Answer 5

Undershoot
North

Overshoot
South

when turning on a northerly heading, stop BEFORE your desired heading
when turning on a southerly heading, turn slightly PAST your desired heading

Question 6

what is ANDS