PAN-PAN

The international radiotelephony urgency signal. When repeated x 3, indicates uncertainty or alert, followed by nature of urgency.

pan-pan x uncertainty

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DIRECTION LIGHT

A light illuminating a sector of very narrow angle and intended to mark a direction to be followed. A direction light bounded by other sectors of different characteristics which define its margins with small angles of uncertainty is called a SINGLE STATION RANGE LIGHT.

direction_light light angle range station direction mark sector uncertainty

UNCERTAINTY

Refers to the difference between measurement by a field instrument and the 'true' or 'actual' quantity being measured.

uncertainty measurement instrument difference

INCERTFA

A SAR uncertainty phase requiring monitoring and intelligence gathering for more task information.

incertfa monitoring sar phase uncertainty uncertainty_phase

INTELLIGENT MACHINE

Any machine that can accomplish its specific task in the presence of uncertainty and variability in its environment.

intelligent_machine machine uncertainty can

CB

Block coefficient - a measure of the fullness of the form of the ship and is the ratio of the volume of displacement to a given water-line, and the volume of the circumscribing solid of constant rectangular cross-section having the same length, breadth and draught as the ship. CB= (L x B x T) The LPP is normally used in calculating the value of CB which varies with the type of ship. Fast ships Ordinary ships Slow ships 0.50-0.65 (fine form) 0.65-0.75 (moderate form) 0.75-0.85 (full form)

cb_ solid displacement lpp coefficient breadth ordinary ratio x block measure form ship b constant draught fast volume

CELSIUS TEMPERATURE SCALE

Temperature scale of 0o (freezing water) to 100o (boiling water). Celsius = (Fahrenheit - 32) x 5/9.

celsius_temperature_scale temperature_scale x scale celsius temperature

FAHRENHEIT

Imperial scale of temperature. Fahrenheit = ((9 x Celsius) 5) + 32

fahrenheit x scale

LANE METRE

A 1.0 metre in length x 2.0 metre in width area of deck (linear metre) used in assessing capacity of Ro/Ro ships.

lane_metre width area length x deck capacity

MIDSHIP SECTION AREA COEFFICIENT

(CM): The ratio of the immersed area of the midship section to the area of the circumscribing rectangle having a breadth equal to the breadth of the ship and a depth equal to the draught. CM = AM (B x T), CM values range from about 0.85 for fast ships to 0.99 for slow ships.

midship_section_area_coefficient_ breadth section area cm depth ratio x midship ship midship_section rectangle range fast

ROLLING TEST

An approximate method of calculating a vessels GM. GM in mtrs = ((F x breadth)x(F x breadth)) Time in secs F = 0.78 - 0.98 dependant on hull shape.

rolling_test hull time x gm

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