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In order to negotiate a plan turn, a constant radius turn concept can be used. Theory and procedures of using constant radius turn are explained below. Suppose the vessel has to take a turn in the path marked in above figure (from A to B). The total course change is Ø° The distance AB= R…
All navigable waters are not yet covered by ENC data and vessel may be required to use ECDIS in Raster Chart Display System (RCDS) mode using ARCS / approved raster charts. If suitable ENC charts are not available from any source, then the use of raster charts is accepted only in conjunction with updated folio…
Sextant A sextant is an instrument used to measure the angle between any two visible objects. Its primary use is to determine the angle between a celestial object and the horizon which is known as the object’s altitude. Using this measurement is known as taking a sight and it is an essential part of celestial…
Duties of an Officer on Watch (OOW) on the bridge The primary duties of an Officer on Watch are: (i) Watchkeeping, (ii) Navigation and (iii) GMDSS radio watchkeeping. Officer on Watch is a representative of the master and is primarily responsible at all times for the safe navigation of the ship and for complying with…
Definitions A Tropical Cyclone is also called as a Tropical Revolving Storm (TRS). It is defined as a roughly circular atmospheric vortex, originating in the tropics or sub tropics, wherein the winds which blow in converging spiral tracks reach or exceed gale force i.e. Beaufort Force 8 (34 – 40 Knots / 62 – 74…
Use of the Safety Depth and the Safety Contour in ECDIS Safety Depth: Value set by the mariner that is used by ECDIS to portray soundings as black if they are equal to or shoaler than the value and gray if they are deeper. Safety Contour Depth: Value set by the mariner that is used by ECDIS…
World Scale 1. World Scale is the “World Tanker Nominal Freight Scale” and is a schedule of freight rates applying to tankers carrying Oil in bulk. 2. Nominal means that the freight rates which world scale provides are intended solely as a standard of reference. 3. World Scale is available on a yearly subscription basis….
Rule 19 Conduct of vessels in restricted visibility (d) A vessel which detects by radar alone the presence of another vessel shall determine if a close-quarters situation is developing and/or risk of collision exists. If so, she shall take avoiding action in ample time, provided that when such action consists of an alteration of course,…
Rule 17 Action by stand-on vessel (a) (i) Where one of two vessels is to keep out of the way, the other shall keep her course and speed. (ii) The latter vessel may however take action to avoid collision by her maneuver alone, as soon as it becomes apparent to her that the vessel required…
Rule 15 Crossing situation When two power-driven vessels are crossing so as to involve risk of collision, the vessel which has the other on her own starboard side shall keep out of the way and shall, if circumstances of the case admit, avoid crossing ahead of the other vessel. Rule 16 Action by give-way vessel …