gyro

In what direction does the axis of the gyro-compass wheel point?

True North

All gyro compasses, when on the equator, should have...

no latitude error.

A gyro compass on a high-speed craft often takes time to settle correctly when altering course. What causes this problem?

the change in the (large) value of the latitude course and speed error when course.

The effect of gravity control makes the axis of the gyroscope...

move anticlockwise around a central position in an ellipse

if the axis of a free gyroscope on the equator is horizontal, the northerly end of the spin axis will...

tilt up if to the east of the meridian.

With reference to magnetism, soft iron...

means that it can change its polarity without change of position.

free gyroscopes are turned into gyro compasses by utilising...

gravity.

From those listed, which are "soft iron" correctors?

The spheres.

When a force is applied at right angles to the spin axis of a free gyroscope, the axis

at 90° to the torque in the direction of the spin.

From those listed, which of the statements about magnetic variation is true?

The value of variation at a place changes slowly.

Precession in relation to a free gyroscope is.

the change of direction of the spin axis when a force is applied at right angles to the axis.

the axis of a free gyroscope is pointed at a star. From those listed, which is NOT correct?
the axis cannot be disturbed from this direction while the rate of spin is maintained.

Magnetic compass deviation changes with....

heading.

Latitude error means that, in the northern hemisphere, the north end of a gyro compass (damped in tilt) settles..

to the east of the meridian and above the horizontal.

Compass error is...

the angle between magnetic compass and true north.

If a ship has permanent magnetism with a blue pole to port, the deviation caused will be...

zero on east and west, west on northerly, east on southerly courses.

The magnetic force exerted at any point in the magnetic field varies...

inversely with the square of the distance from the magnet.

If the axis of a free gyroscope in a north latitude is horizontal and pointed to the east of north of the meridian, it will..

drift east and tilt up.

The principle of a fibre-optic "gyro" compass relies on...

three fibre-optic rings, mounted on a platform, which sense the rotations of the platform due to ship and earth movement

The effect of Gaussin or Retentive error when a ship alters course is to produce a...

westerly error if she swings to starboard and vice versa.

To convert a magnetic course to a true course, it is necessary to apply ....

variation.

To convert a compass course to a magnetic course, it is necessary to apply.....

deviation.

Damping in tilt in a gyro compass produces..

an error which varies with latitude

the proces of turning a gravity controlled gyroscope into a compass is called..

damping.

Damping in azimuth in a gyro compass produces...

a settling position exactly on the meridian.

with reference to magnetism, hard iron...

is iron which retains its magnetism when the inducing field is removed.

The "magnetic variation" is the angle between...

the geographic and magnetic meridians.

Gyroscopic inertia means that the spin axis of a free gyroscope...

points in the same direction in space, unless a force is applied.

The angle between the magnetic north and the true north is .....

variation

The two unique properties of a free gyroscope are...

precession and gyroscopic inertia.

The magnetic equator is...

the line joining places where the dip is zero.

The deviation of a compass produced by a disturbing magnet varies...

inversely with the cube of the distance from the magnet.

What is meant by "retentive magnetism" with regard to a ship's magnetic compass?

The ship retains induced magnetism if the ship has been heading in the same direction for a considerable period.