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Latitude
The north/south measurement of position perpendicular to the earth' s polar axis.
Longitude
An east/west measurement of position in relation to the Prime Meridian, an imagi-
nary circle that passes through the north and south poles.
Position
An exact, unique location based on a geographic coordinate system.
Sensitivity
A measure of how sensitive the sounder is to sonar echoes.
Speed Over Water (SOW)
The speed you are traveling over the surface of the water.
Thermocline
A layer of water separating warmer water above from cooler water below.
Track (TRK)
The direction of movement relative to a ground position.
Universal Transverse Mercator (UTM)
A grid coordinate system that projects global sections onto a flat surface to measure
position in specific zones.
Velocity Made Good (VMG)
The speed you are traveling in the direction of your destination.
Waypoint
A specific location saved in the receiver' s memory.
Whiteline
A term applied to the checkered portion of the sonar display which shows the area
of strongest sonar return (typically the bottom).
INTRODUCTION
Glossary
3
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