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	Eng ID	Term	Definition
	4001	position doubtful	Of uncertain POSITION. The expression is used principally on CHARTS to indicate that a WRECK, SHOAL, etc., has been reported in various ... more Of uncertain POSITION. The expression is used principally on CHARTS to indicate that a WRECK, SHOAL, etc., has been reported in various POSITIONS and not definitely determined in any. Usually shown by the abbreviation 'PD'.
	4002	positioning	The process of determination of a position.
	4003	position line	See LINE OF POSITION.
	4004	positive	In PHOTOGRAPHY, an IMAGE of the original object which corresponds to the same in the scheme of light and shade.
	4005	positive altitude	See ANGLE OF ELEVATION.
	4006	positive gradient	In OCEANOGRAPHY, a positive rate of change with DEPTH.
	4007	post	A small BEACON, more substantial than a PERCH, used for marking CHANNELS. See also PILE.
	4008	potable water intake (PWI)	A structure designed for the intake of drinking water. The intake is usually elevated above the bottom, supported and protected by a debris�... more A structure designed for the intake of drinking water. The intake is usually elevated above the bottom, supported and protected by a debris‑screening structure (CRIB), a separately charted feature.
	4009	potential density	In OCEANOGRAPHY, the DENSITY that a parcel of water would have if raised adiabatically to the surface, that is, if determined from the parce... more In OCEANOGRAPHY, the DENSITY that a parcel of water would have if raised adiabatically to the surface, that is, if determined from the parcel's 'in situ' SALINITY and POTENTIAL TEMPERATURE.
	4010	potential temperature	In OCEANOGRAPHY, the temperature that a WATER SAMPLE would attain if raised adiabatically to the sea surface. For the deepest points o... more In OCEANOGRAPHY, the temperature that a WATER SAMPLE would attain if raised adiabatically to the sea surface. For the deepest points of the OCEAN, which are just over 10 000 METRES, the adiabatic cooling would be less than 1.5° C.
	4011	pound	A unit of mass, equal to 0.45359237 KILOGRAMS.
	4012	power	See MAGNIFYING POWER.
	4013	precautionary area	A routeing measure comprising an area within defined limits where ships must navigate with particular caution and within which the direction... more A routeing measure comprising an area within defined limits where ships must navigate with particular caution and within which the direction of traffic flow may be recommended.
	4014	precession	Change in the direction of the AXIS of ROTATION of a spinning body, as a GYROSCOPE, when acted upon by a torque. The direction of motion of ... more Change in the direction of the AXIS of ROTATION of a spinning body, as a GYROSCOPE, when acted upon by a torque. The direction of motion of the AXIS is such that it causes the direction of spin of the GYROSCOPE to tend to coincide with that of the impressed torque.
	4015	precession of the equinoxes	The conical motion of the EARTH's AXIS about the vertical to the plane of the ECLIPTIC, caused by the attractive force of the SUN, MOON, and... more The conical motion of the EARTH's AXIS about the vertical to the plane of the ECLIPTIC, caused by the attractive force of the SUN, MOON, and other PLANETS on the equatorial protuberance of the EARTH.
	4016	precipitation	PHENOMENON made up of an aggregate of aqueous particles, liquid or solid, crystallized or amorphous, which fall from a CLOUD or group of CLO... more PHENOMENON made up of an aggregate of aqueous particles, liquid or solid, crystallized or amorphous, which fall from a CLOUD or group of CLOUDS and reach the ground.
	4017	precipitation intensity	Amount of PRECIPITATION collected in unit time interval. See RAINFALL AMOUNT.
	4018	precision	The degree of refinement of a value not to be confused with ACCURACY, which is the degree of conformance with the correct value.
	4019	precision ephemeris	The ephemeris which describe the orbit of a navigational satellite precisely. They are of higher precision than the broadcast ephemeris but ... more The ephemeris which describe the orbit of a navigational satellite precisely. They are of higher precision than the broadcast ephemeris but not available in real time.
	4020	predicted tide(s)	See TIDE.
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