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8 Haziran 2008 Pazar

Gyro Compass

The compass errors, compass correction,

i) North Speed Error & Correction,

The gyro system installed on our ship provides automatic correction of the north speed error. If the correction is active, the system permanently calculates the north speed error from the current speed and position and corrects the gyrocompass heading data accordingly.

ii) Alignment Error & Correction,

In order to obtain correct heading data, the existing alignment error (i.e. the angle between the compass’ and the vessel’s longitudinal axes) must be determined and the required correction applied. Alignment error 0 degree if the sides of the compass housing run exactly parallel to the vessel’s longitudinal axis and the back of the housing points dead ahead. Alignment error correction is carried out electronically by setting the required correction value in the service setup of the gyro system.

The Starting of the Compass;

Switch on the gyrocompass three hours before it is required for service.

- To start, turn the gyro power switch from off position to the on position.

- When the above switch is turned to the on position, the gyro power supply lamp (blue) and the repeater power supply lamp (amber) both light. Then after about ten minutes, the gyro running-up lamp (green) lights.

- The buzzer in the steering stand sounds when the gyro power switch is turned to the on position, silence it by turning the alarm silence switch.

With the above operations, the master compass starts its north seeking action and settles after about three hours.

Repeaters;

We have three repeaters on the bridge one in port , one in starboard, one in the center of the bridge.

We have three controls on auto pilot. These controls are weather,

counter rudder, and rudder controls. These controls are explained below:

Weather (Yawning): This control has 4 positions. These are 0, 1, 2, 3 positions. This control adjusts the sensitivity of the auto pilot according to the weather conditions.

Counter rudder: When changing the course the heading will tend to go beyond the necessary course. To prevent this thing the angle of the rudder is increased in short periods. When this control is off the movement of the rudder is done freely.

Rudder: This control adjusts the rudder angle applied when the deviating

course of the ship is 1 degree.

Pilot watch: During auto-steering, when the course deviation exeeds the

calue set at this control, the alarm generates to warn the officer.

The Use of Gyro Input to Navigation Equipment;

The gyrocompass has been essential source for seamen since it has been invention. It is more reliable than magnetic compass. It is stable between 70°N-70°S latitudes. It is accepted as a north by the seafarers. This reasons which mentioned above and also additionally too many reasons; the gyrocompass is our one of the most important navigation equipment. With correction of gyrocompass its input can be used on the charts.

The Alarms Fitted to a GyroCompass;

The alarm buzzer incorporated on the gyrocompass when the power supplies of the master and repeater compasses are off. After the trouble has been confirmed, turn the alarm silence switch to the opposite side to stop buzzer. When the trouble is solved, the buzzer sounds again, turn alarm silence switch to the opposite side to silence buzzer.

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