Magnetic Compass & SOLAS Performance Standards - MCQ Quiz

According to SOLAS, what is the primary function of the magnetic compass on a modern vessel?

• To serve as the main heading reference for all open-sea navigation.

• To provide critical directional information if the gyrocompass fails.

• To calculate the vessel's exact position using celestial navigation.

• To calibrate the electronic chart display and information system.

A vessel's standard magnetic compass must be positioned to minimize error. What is the key SOLAS requirement for its location?

• It must be installed as close to the vessel's centerline as is practicable.

• It should be located in a dedicated chart room free from all vibration.

• It must be placed directly above the vessel's center of gravity.

• It should be situated adjacent to the primary radar display unit.

The requirement for a magnetic compass repeater at the emergency steering station is primarily intended to ensure:

• Continuous speed and depth readings during a main power failure.

• Redundant communication abilities during an emergency

The deviation card maintained on board a vessel primarily documents:

• The annual change in magnetic variation for the operating area.

• The error caused by the ship's own magnetic field on the compass.

• The precise location of the magnetic north pole for the current year.

• The calibration schedule for the vessel's gyrocompass system.

A qualified compass adjuster is required to periodically adjust the magnetic compass to primarily correct for:

• The inherent inaccuracy of the compass card's graduation marks.

• The precession error caused by the Earth's rotation over time.

• The deviation caused by the vessel's specific magnetic environment.

• The variation difference between true north and magnetic north.

The performance standard for magnetic compass accuracy, as established by the IMO, requires it to be within:

• 0.5 degrees under all weather and sea conditions.

• 1.0 degree under normal operating conditions.

The design requirement for a magnetic compass to function accurately in both hemispheres without recalibration emphasizes the importance of:

• Using a globally standardized damping fluid viscosity.

• Robust construction resistant to shock and vessel vibration.

• A design that inherently minimizes magnetic interference.

• Illumination systems that do not degrade over time.

The purpose of the liquid damping system in a magnetic compass is to:

• Counteract the corrosive effects of saltwater and humid air.

• Stabilize the compass card and reduce excessive oscillation.

• Provide illumination for the card during nighttime operations.

• Lubricate the pivot point to ensure a friction-free movement.

The performance standard requiring "repeatability" ensures that the compass:

• Can be easily repaired at sea using standard spare parts.

• Provides consistent readings over the same heading and conditions.

• Will automatically reset after a significant course alteration.

• Is checked against the gyrocompass at regular intervals.

According to performance standards, what is the general maximum allowable deviation in any direction after proper adjustment?

• It should generally not exceed 1 degree in any direction.

• It should generally not exceed 3 degrees in any direction.

• 3.0 degrees after all compensations have been applied.

• 5.0 degrees as a minimum safety threshold.