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).