Leica MX400 Operating Instructions Manual page 220

Glossary
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
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.
POSITION UPDATE
The redefining of position by analysis of satellite orbital data as
referenced to time.
PRN
See PSEUDO-RANDOM 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.
PSEUDO-RANDOM NUMBER (PRN)
The identification number of a GPS satellite.
PSEUDO-RANGE
Range that includes errors due to clock offset.
PULSE SPEED SENSOR
Speed log whose speed output signal is defined by a pulse rate
output.
RANGE RESIDUAL
Version 3.3
Operator's Manual
207