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192 | Appendix E - Glossary

PARITY CONVENTION

In checking message parity (refer to PARITY CHECK), the software may be

designed to check either odd parity or even parity. The choice is called parity

convention: either odd or even parity convention. Under odd parity convention

rule, the binary-coded message has the parity bit set to make up an odd number

of message bits. Under even parity convention rules, the binary-coded message

has the parity bit set to make up an even number of message bits.

P-CODE

A limited-access signal broadcast by the NAVSTAR satellites currently available

only to military users.

PDOP (Position Dilution of Precision)

An indicator of the accuracy in position (latitude, longitude, and altitude). See

DILUTION OF PRECISION.

PLANE PROJECTION

The technique of converting the curved surface of the Earth to a flat surface to

represent a map.

olled Mode

A transponder is in a polled mode during a request-response session only.

Distinguish this from a station, which is polled into certain slots. This station is

first polled and then enters assigned mode.

POSITION UPDATE

The redefining of position by analysis of satellite orbital data as referenced to time.

PRN

See PSEUDORANDOM NUMBER.

PROCESSOR

The processor circuit card in the console that controls system operations and

computes the positioning/ navigation solutions.

PROMPT

A message on the display instructing the operator to make a keyboard entry.

PSEUDORANDOM NUMBER (PRN)

The identification number of a GPS satellite.

PSEUDO-RANGE

Range that includes errors due to clock offset.

PSP

Presentation System Port – A communication port on the AIS transponder

used as an interface to external systems, i.e. the MX420.

PULSE SPEED SENSOR

Speed log whose speed output signal is defined by a pulse rate output.

RANGE RESIDUAL

The difference between the expected satellite range and the measured satellite

range for the last measurement taken from each satellite in the constellation.

RATDMA

Random Access Time Division Multiple Access – Access protocol for

transmissions which have not been pre-announced. This is used for the

first transmission during data link network entry or for messages of non-

repeatable character.

REFERENCE COMPASS

The compass against which the steering compass (see STEERING COMPASS) may

be calibrated.

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