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The course keeper, or directional

 The course keeper, or directional

It also gives the magnetic heading and makes it possible to overcome errors of the compass due

to flight conditions.

However, after a while, the directional gyroscope loses its reference.

orientation. It is therefore necessary periodically (every quarter of an hour) to readjust the directional on the

compass reference, using the dial. This is done in a straight line and at

almost constant speed.

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