navigation acronyms, abbreviations and definitions - International ...

pax passengers
PaxCar RoRo ferry for longer routes with cars, treated as a passenger vessel
PAYD pay-as-you-drive
PB-NAV Programme Board on Satellite Navigation (ESA)
PBN performance-based navigation
Navigation system, largely based on satellite navigation, whereby
aircraft can navigate point-to-point.
PC personal computer
PC phase code (eg LORAN)
PCA possible course of action
PCD preferred compass direction (used in animal navigation work)
PCI phase code interval (LORAN-C)(20 times the GRI)
PCM phase change memory
PCM pulse code modulation
PCMCIA Personal Computer Memory Card International Association
PCS personal communication services (eg cellphone)
PD public domain
PDA personal digital assistant (electronic handheld information device)
PDA premature descent alert (TAWS)
PDC personal digital communicator
PDC pre-departure clearance (ATC)
PDC Public Data Corporation (UK Government, launched Jan 11)
PDD Presidential Decision Directive (US)
PDD NSTC-6 (28 Mar 96) applied to GPS. Included provision of SPS
free of user charges. Replaced by PNT Policy Directive Dec 2004.
PDF Portable Document Format
Standard for making electronic documents portable. Usually created
on Adobe Acrobat Writer and read by Adobe Acrobat Reader.
PDF probability density function
PDL pseudolite
PDO process data object
PDOP positional dilution of precision
The factor by which the accuracy of a 3-D fix is degraded by
geometrical considerations.
PDR preliminary design review
PDSS Pilot Decision Support System (maritime)
PDT Peripheral Detection Task (to measure objective workload)
PE-90 A Russian terrestrial reference frame (diff from WGS 84 by 1-2 m)
PEC Pan European Conference (IFALPA)
PED personal electronic device
PEGASUS Prototype EGNOS Analysis System Using SAPPHIRE (EUROCONT’L)
Pelagic of, performed on or belonging to the upper layers of the open sea
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