El Navigation Aids Requirements 6 PDF

A\) All ships irrespective of size shall have: 1\. a properly adjusted standard magnetic compass or other means, independent of any power supply to determine the ship\'s heading and display the reading at the main steering position; 2\. a pelorus or compass bearing device, or other means, independ...

A\) All ships irrespective of size shall have: 1\. a properly adjusted standard magnetic compass or other means, independent of any power supply to determine the ship\'s heading and display the reading at the main steering position; 2\. a pelorus or compass bearing device, or other means, independent of any power supply to take bearings over an arc of the horizon of 360°; 3\. means of correcting heading and bearings to true at all times; B\) All ships of 150 gross tonnage and upwards and passenger ships irrespective of size shall, in addition to the requirements of paragraph A, be fitted with 1\. a spare magnetic compass interchangeable with the magnetic compass, as referred to in paragraph A.1, or other means to perform the function referred to in paragraph A.1 by means of replacement or duplicate equipment C\) All ships of 300 gross tonnage and upwards and passenger ships irrespective of size shall, in addition to meeting the requirements of paragraph B, be fitted with: 1\. an echo sounding device, or other electronic means, to measure and display the available depth of water; 4\. speed and distance measuring device, or other means, to indicate speed and distance through the water; E\) All ships of 500 gross tonnage and upwards shall, in addition to meeting the requirements of paragraph C with the exception of paragraphs C.3 (EPA) and C.5 (THD), and the requirements of paragraph D, have: 1\. a gyro compass, or other means, to determine and display their heading by shipborne non-magnetic means, 2\. a gyro compass heading repeater, or other means, to supply heading information visually at the emergency steering position if provided; 3\. a gyro compass bearing repeater, or other means, to take bearings, over an arc of the horizon of 360º, H\) All ships of 10,000 gross tonnage and upwards shall, in addition to meeting the requirements of paragraph G with the exception of paragraph G.2, have: 2\. a heading or track control system, or other means, to automatically control and keep to a heading and/or straight track. I\) All ships of 50,000 gross tonnage and upwards shall, in addition to meeting the requirements of paragraph H, have: 2\. a speed and distance measuring device, or other means, to indicate speed and distance over the ground in the forward and athwartships direction GYRO-COMPASSES In latitudes of up to 60° : the residual steady state error, after correction for speed and course influences at a speed of twenty knots, shall not exceed ± 0.25 x secant latitude; the error due to a rapid alteration of speed of twenty knots should not exceed ± 2°; the error due to a rapid alteration of course of 180° at a speed of twenty knots should not exceed ± 3° ; the transient and steady state errors due to the ship rolling, pitching and yawing, with simple harmonic motion of any period between six and fifteen seconds, maximum angle of 20°, 10° and 5° respectively, and maximum horizontal acceleration tool exceeding 1m/s2 , should not exceed ° x secant latitude. LOGS 3.1 Errors in the measured and indicated speed, when the ship is operating free from shallow water effect and from the effects of wind, sea bottom type, current and tide, should not exceed the following: for a digital display - 2% of the speed of the ship, or 0.2 knots, whichever is greater; for an analogue display -- 2.5% of the speed of the ship, or 0.25 knots, whichever is greater; and for output data transmission -- 2% of the speed of the ship, or 0.2 knots, whichever is greater. ECHOSOUNDERS 3.1 The equipment should provide a minimum of two range scales one of which, the shallow range, should cover a range of 20 m, and the other, the deep range, should cover a range of 200 m. 10 Accuracy of measurement Based on a sound speed in water of 1,500 m/s, the tolerance of the indicated depth should be either: +/- 0.5 m on the 20 m range scale, respectively +/- 5 m on the 200 m range scale; or +/- 2.5% of the indicated depth, whichever is greater