Ship Navigation Equipment Standards

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Questions and Answers

Which device is required on all ships irrespective of size to determine the ship's heading?

A radar system

An electronic chart display

A GPS navigation system

A properly adjusted standard magnetic compass (correct)

What is an additional requirement for ships of 150 gross tonnage and upwards?

A spare magnetic compass (correct)

A weather forecasting device

An autopilot system

A depth sounder

What capability must ships of 300 gross tonnage and upwards have, in addition to a spare magnetic compass?

A sonar imaging device

A satellite communication system

An echo sounding device (correct)

A fixed radar system

What type of compass is required for all ships of 500 gross tonnage and upwards?

A gyro compass Signup and view all the answers

Which ships must have a heading or track control system?

All ships of 10,000 gross tonnage and upwards Signup and view all the answers

Which of the following requirements applies to all ships irrespective of size, as stated in paragraph A?

Means of correcting heading and bearings to true at all times Signup and view all the answers

What additional equipment must ships of 300 gross tonnage and upwards possess beyond a gyro compass?

A speed and distance measuring device Signup and view all the answers

Which of these is not a requirement for ships of 10,000 gross tonnage and upwards?

A secondary navigation system Signup and view all the answers

What must all ships of 500 gross tonnage and upwards have for displaying their heading?

A gyro compass heading repeater Signup and view all the answers

What is the maximum steady state error for a gyro-compass operating at a speed of twenty knots in latitudes up to 60°?

± 0.25 x secant latitude Signup and view all the answers

How much error is tolerated in a rapid alteration of speed of twenty knots for a gyro-compass?

± 2° Signup and view all the answers

For a digital speed display, what is the maximum allowable error in measured speed?

2% of the speed of the ship or 0.2 knots Signup and view all the answers

What is the maximum error for an analogue speed display?

2.5% of the speed of the ship or 0.25 knots Signup and view all the answers

What are the required range scales for echo sounders?

One range covering 20 m and another covering 200 m Signup and view all the answers

What is the acceptable tolerance for indicated depth on a 20 m range scale?

± 0.5 m Signup and view all the answers

What is the maximum error for indicated depth on a 200 m range scale?

± 5 m Signup and view all the answers

What might the maximum transient and steady state errors be due to ship motion?

± 3° for simple harmonic motion with specific parameters Signup and view all the answers

What is the maximum horizontal acceleration tolerance for the errors in measurement?

1 m/s2 Signup and view all the answers

What is the maximum error allowable in output data transmission?

2% of the speed of the ship or 0.2 knots Signup and view all the answers

Study Notes

All ships must have a properly adjusted magnetic compass or alternative means, independent of power, to determine heading and display the reading at the main steering position.
All ships need a pelorus or compass bearing device or alternative means, independent of power, to take bearings over a 360-degree arc.
All ships must have a method for correcting heading and bearing readings to true at all times.
Ships of 150 gross tonnage or more and passenger ships require a spare magnetic compass interchangeable with the primary compass or an alternative means to perform the same function through replaceable equipment.
Ships of 300 gross tonnage or more and passenger ships need an echo sounder or other electronic means to measure and display available water depth. They also need a speed/distance measuring device to show speed and distance through the water.
Ships of 500 gross tonnage or more require a gyro compass or alternative means to determine and display heading by non-magnetic means. This includes a heading repeater for the emergency steering position, if provided. They require a bearing repeater for bearing over a 360-degree arc.
Ships of 10,000 gross tonnage or more need a heading or track control system or similar means to automatically maintain a heading or straight track.
Ships of 50,000 gross tonnage or more need a speed and distance measuring device to show speed and distance over the ground both fore-and-aft and sideways.
Gyro-Compasses (up to 60 degrees latitude): Residual errors in steady state, after correcting for speed and course, should not exceed ±0.25 x secant latitude. Errors caused by rapid speed changes or course alterations should not exceed ±2° and ±3°, respectively. Transient/steady state errors due to rolling, pitching or yawing should not exceed defined limits.
Speed Indication Errors (all ships): Digital displays should not have an error greater than 2% or 0.2 knots, whichever is higher. Analog displays should have an error of 2.5% or 0.25 knots, whichever is higher. Data transmission systems should also meet these tolerances.
Echo Sounders: Must have at least two range scales, one for shallow water (up to 20m) and one for deep water (up to 200m). Depth measurements should have a tolerance of +/-0.5m or 2.5% of the reading, whichever is greater.

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Description

This quiz covers the essential navigation equipment requirements for ships based on their tonnage and passenger capacity. Test your knowledge of mandatory instruments such as compasses, echo sounders, and other devices critical for safe maritime operations.