208
Version 2.0
Operator’s Manual
Glossary
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 op-
erations and computes the positioning/ navigation solutions.
PROMPT
A message on the display instructing the operator to make a key-
board 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 mea-
sured satellite range for the last measurement taken from each sat-
ellite 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.
Summary of Contents for MX420
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