Glossary MicronNav System
0656-SOM-00001-07 143 © Tritech International Ltd.
GB Gigabyte = 1000MB
GPS Global Positioning System.
IEC International Electro-technical Committee
JPEG or JPG Joint Photographics Expert Group - a compression method and file
format for image files, files can be stored with either .jpeg or .jpg
file extensions
LAN Local Area Network
LED Light Emitting Diode
MB Megabyte = 1000kB
Mbit·s
-1
Megabit per second - data transfer rate equal to 1000 kilobits per
second.
MicronNav An Ultra Short Baseline (USBL) system for location and tracking
of ROVs, divers, etc. Consists of the MicronNav 100 surface
control unit (similar to the SeaHub but with different functionality) a
"dunking transducer" which is mounted on the vessel/dockside under
the waterline and a responder which is mounted on the ROV or
Hammerhead tripod.
MRU Motion Reference Unit
NMEA National Marine Electronics Association - a USA based standards
association responsible for overseeing electrical and data
communications standards between marine devices (due to become
the IMEA or International Marine Electronics Association in 2012).
NTSC National Television System Committee - an analogue television
standard used in most of North America.
OSGB Ordnance Survey National Grid reference system, a geographic grid
referencing system used in Great Britain and its outlying islands.
PAL Phase Alternating Line - an analogue television colour encoding
system.
PC Personal Computer
PPI Plan Position Indicator for showing position on the MicronNav software
display.
RAM Random Access Memory
RAT Remote Access Terminal - the detachable front part of the Tritech
Surface Control Unit (SCU) computer. Provides an alternative to using
a keyboard and mouse.
ROV Remotely Operated Vehicle
RS232 Traditional name for a series of standards for serial binary data control
signals.
RS485 A standard for defining the electrical characteristics of drivers and
receivers for use in a balanced digital multipoint system (also known
as EIA-485).
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