Marine Sea Scan Manual page 40

36 Sea Scan® Survey Software Manual
hydrophone
intensity
interference
L/L
latitude
lane
lateral layback
layback (LB)
longitude
lossy medium
LUT
magnetometer
marker
MB
MRU
nadir
NMEA
NMEA Protocol
0183
An instrument that transforms an underwater
sound wave into an electrical signal
The strength of the returning acoustic signal
Erroneous signals caused by acoustic or
electronic sources
Latitude/Longitude
An imaginary horizontal line joining points on
the Earth's surface that are all of equal distance
north or south of the equator
The straight track the surface vessel follows while
towing the towfish
The offset distance to the left (port) or
(starboard) between the navigation antenna and
the towfish
The surface distance between the navigation
antenna and the towfish
The angular distance east or west of the prime
meridian that stretches from the North Pole to
the South Pole and passes through Greenwich,
England
The physical degradation of an acoustic signal as
a result of such conditions as absorption by the
water, wave-front spreading, or scattering
Look-Up Table
An external device that measures the current
total magnetic field
An item of interest the operator can tag in the
SONAR window; the item might be a feature on
the bottom or an item of interest
MegaByte (1,000,000 Bytes)
Most Recently Used
A point along the swath that is directly beneath
the towfish; a location in the acoustic pulse
The National Marine Electronics Association
A standardized protocol that allows marine
instruments to transmit and receive depth
information. This communication is based on a
block transmission or groups of NMEA 0183
sentences, which are transmitted over the serial
cable. Each sentence has a header that uniquely
© 2013 Marine Sonic Technology, Ltd.