4
1 About this Manual
1.1 Glossary
Terms used in this manual include:
DIV Division
echo sounder
A device that measures the depth of water under a ship, by
measuring the time between sending a sound pulse and
receiving its echo from the seabed
electromagnetic log
A type of speed log that uses electromagnetic
measurements to calculate the speed of a vessel through
water. Compare with acoustic Doppler log, which calculates
the speed through the water or relative to the seabed by
detecting shifts in frequency of acoustic echoes. EMES60 uses
an electromagnetic log.
HMI Human-machine interface: screen units that give readouts of
speed and depth, and allow the user to control and set up
the system
IMO International Maritime Organization
Interface Unit
EMES60 electronic unit that connects sensor, Sensor Power
Unit and ship’s power
longitudinal speed Speed in the aft-fore direction of the vessel
opto Short for “opto-isolated”
opto-isolated An electrical input that is separated electrically from the
inputting device using an optical converter circuit
Sensor Power Unit EMES60 electronic unit that connects HMI units, external
equipment and Interface Unit
speed log
A device that measures the speed of a ship relative to the
water around it and the seabed under it
TVG
Time Varied Gain, signal compensation that removes
transmission loss effects from echosounder data
transducer A device that converts electrical signals to sound and back
again
transverse speed Speed in the port-starboard direction of the vessel
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