THE MAGNETIC COMPASS.

Although Man is now an experienced flier, he is born without the flying instinct. All his achievements (which he has made over the last century) are basically intellectual.

Since the 16th century B.C., when loadstone was discovered,

Man has been studying the magnetic field of the earth (known as the terrestrial magnetism). In his study, he has found out that the earth behaves like a weak magnetic bar whose field is virtually parallel to the True meridians. He then applied this fact by inventing the magnetic compass. The magnetic compass has enabled him to set up direction bearings across the land, sea, and in the air.

6.1. Types of Magnetic Compasses.

A magnetic compass is the DR navigational reference for the aircraft Heading (Drg. 1.1). Like all navigational instruments

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Question 1.

An aircraft is heading 210 (ºC). Acceleration in a turn of 60º to port is then made with reference to the DGI. Immediately on completion of the turn, will the direct reading compass indicate 150º, more than 150º, or less than 150º; when the aircraft is

a.At the magnetic Equator

b.In the Southern hemisphere?

C.P.L. [10]

Solution:

Part (a)

At the magnetic Equator all dynamic deviations are zero

The Direct Reading compass will indicate 150 ( C).

Part (b)