Egypt Maritime COC Deck flashcards

34 cards. Read the term and the definition here. The deck at the top of this page is optional.

Mercator sailing formula

Uses difference of meridional parts: tan(course) = DLo / DMP, and distance = DLat / cos(course). DMP is found from tables or by 7915.7 log10 tan(45° + latitude/2).

Plane sailing limits

Plane sailing treats the Earth as flat and is acceptable for short legs, typically under about 600 nautical miles, or at low latitudes. Error grows with latitude and difference of longitude.

Under-keel clearance allowance

The margin between the keel and the seabed. A common policy is at least 10 percent of static draught in exposed water, increased for squat, heel, swell and chart accuracy.

Sextant index error

The residual error on the sextant arc when the horizon is viewed directly and its reflected image is aligned. It is applied to every observed altitude, with sign, before other corrections.

Intercept method

Calculate the computed altitude Hc and azimuth from an assumed position, then plot intercept = Ho minus Hc along the azimuth: towards the body if positive, away if negative.

Latitude by meridian passage

At upper transit the body bears due north or south. Latitude is zenith distance plus declination when they share the same name, or zenith distance minus declination when they differ.

Star GHA from Aries

Greenwich hour angle of a star equals the Greenwich hour angle of Aries at the same instant plus the star's sidereal hour angle, kept within 0 to 360 degrees.

Overtaking rule

Rule 13: a vessel coming up from more than 22.5 degrees abaft the beam is overtaking and must keep clear until finally past and clear, whatever her propulsion.

Crossing rule give-way

Rule 15: a power-driven vessel with another on her own starboard side must keep out of the way, and should normally avoid crossing ahead of the stand-on vessel.

Restricted visibility action

Rule 19: no stand-on vessel exists. Reduce to safe speed, and on detecting risk of collision take substantial action early, avoiding a turn to port for a vessel forward of the beam.

Traffic separation scheme crossing

Rule 10: cross traffic lanes on a heading as nearly as practicable at right angles to the general direction of traffic flow, and do not anchor inside a scheme.

Righting lever and GM

At small angles the righting lever GZ equals GM times sine of the heel angle. Positive GM means the centre of gravity is below the transverse metacentre and the ship is stable.

Free surface correction

The virtual rise of the centre of gravity caused by liquid with a free surface. It equals the second moment of area of the surface times density, divided by the ship's displacement.

Angle of loll

The heel angle of a ship with negative initial GM where the righting lever is zero. It is corrected by lowering the centre of gravity, not by counter-ballast alone.

Trim by MCTC

Change of trim in centimetres equals the trimming moment in tonne-metres divided by the moment to change trim one centimetre, taken from the hydrostatic tables at the draught.

IMDG segregation away from

Segregation code 1: the goods must be effectively segregated from each other so that incompatible goods cannot interact dangerously, but may be carried in the same compartment.

Stowage factor

The volume in cubic metres occupied by one tonne of cargo, including its natural voids. Used with broken stowage allowance to calculate the space needed for a parcel.

Cargo deadweight

Deadweight minus bunkers, fresh water, ballast, stores and constants. It is the weight of cargo that can be loaded while remaining within the load line and stress limits.

Collision bulkhead position

SOLAS requires the collision bulkhead not less than 0.05 of the length and normally not more than 0.08 of the length from the forward perpendicular, extending to the freeboard deck.

Hogging and sagging

Hogging is excess buoyancy amidships with the deck in tension. Sagging is excess weight amidships with the deck in compression. Both load the hull girder in longitudinal bending.

Summer freeboard

The distance measured vertically from the freeboard deck to the centre of the load line ring. It fixes the maximum draught permitted in the summer zone.

Buys Ballot's law

In the Northern Hemisphere, stand with your back to the wind and low pressure lies to your left. The rule is reversed in the Southern Hemisphere and gives the bearing of the storm centre.

Dangerous semicircle

The half of a tropical cyclone, relative to its track, where the wind and the storm's advance combine. In the Northern Hemisphere it lies to the right of the track.

Advection fog

Forms when warm moist air moves over a colder sea surface and is cooled to its dew point. It is common over the Grand Banks and can persist for long periods.

GMDSS sea area A3

An area within the coverage of an Inmarsat geostationary satellite providing alerting, typically between about 70 degrees north and 70 degrees south, outside sea areas A1 and A2.

DSC distress alert

An automated alert sent on VHF channel 70 or the MF/HF DSC distress frequencies, containing the ship's identity and nature of distress, followed by voice on VHF 16 or MF 2182.

SART operation

A 9 GHz radar transponder that, when interrogated by a ship's radar, displays a line of twelve dots on the screen, giving a bearing and range to the survival craft.

Sulphur emission control area

MARPOL Annex VI limits fuel sulphur to 0.10 percent inside designated emission control areas such as the Baltic, North Sea, North American and Caribbean Sea areas, against 0.50 percent globally.

Innocent passage

UNCLOS right of ships to pass through another state's territorial sea continuously and expeditiously without threatening peace, good order or security, subject to coastal state laws.

Muster list content

SOLAS requires the muster list to specify assembly stations, alarm signals, duties of each crew member and substitutes for key persons who may become disabled, posted before sailing.

Class B fire extinguisher

Used for fires involving flammable liquids such as oil and fuel. Foam, carbon dioxide and dry powder are suitable agents; a solid water jet can spread the burning liquid.

Williamson turn

A man overboard manoeuvre: alter course 60 degrees to one side, then 120 degrees the other way when the vessel has turned 240 degrees, to return on a reciprocal track.

Search coverage factor

The ratio of sweep width to track spacing. A factor of 1.0 gives a probability of detection of about 0.63 for the search object, so closer spacing is used when detection must be higher.

On-scene coordinator duties

The vessel designated to coordinate search units at the scene, assigning search areas and patterns, maintaining communications with the SAR mission coordinator, and reporting sightings.