Knowledge Base
PGN
Parameter Group Number (PGN). The NMEA 2000® standard refers to a packet of information as a PGN, this is opposed to the NMEA 0183 standard that refers to a packet of information as a sentence.

pier
A loading platform extending at an angle from the shore.

pile
A wood, metal or concrete pole driven into the bottom. Craft may be made fast to a pile; it may be used to support a pier (see Piling) or a float.

piling
Support, protection for wharves, piers etc.; constructed of piles (see Pile)

piloting
Navigation by use of visible references, the depth of the water, etcetera.

pitch
Rotation around the Y-Axis. In a plane, this is the rotation around the axis defined by the wings.

planing
A boat is said to be planing when it is essentially moving over the top of the water rather than through the water.

planing pull
A type of hull shaped to glide easily across the water at high speed.

port
The left side of a boat looking forward. A harbor.

precision
A measure of how close the outcome of a series of observations or measurements cluster about some estimated value of a desired quantity, such as the average value of a series of observations of a quantity. Precision implies repeatability of the observations within some specified limit and depends upon the random errors encountered due to the quality of the observing equipment, the skill of the observer and randomly fluctuating conditions such as temperature, pressure, refraction, etc. [compare with Accuracy].

privileged vessel
A vessel that, according to the applicable Navigation Rule, has right-of-way (this term has been superseded by the term "stand-on").

proprietary sentence
A sentence to be sent across the interconnecting link which is not included in the List of Approved Sentences of the NMEA 0183 standard. All proprietary sentences sent over the interconnecting link shall contain a unique talker identifier that begins with a "P" (HEX 50) followed by a three-character manufacturer identification code.

 
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