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Thermocline— A layer of water separating warmer water above from cooler water below.
Turn (TRN)— The difference and direction in degrees between the bearing to your destination
and your course over ground. The TRN value is used to indicate what direction, and how many
degrees, to turn to get back on course.
Universal Time Coordinated (UTC)— The time of day at the prime meridian (0º longitude)
in Greenwich, England.
Universal Transverse Mercator- (UTM)— A grid coordinate system that projects global sec-
tions onto a flat surface to measure position in specific zones.
Velocity Made Good (VMG)—The speed you are traveling in the direction of the destination.
Waypoint—A specific location saved in the receiver’s memory.
Whiteline—A term applied to the portion of the sonar display which shows the area of
strongest sonar return (typically the bottom).
94
SECTION
E
APPENDIX
Glossary
NORTH
“ACTIVE FROM”
WAYPOINT
NORTH
DTK
CROSSTRACK ERROR
XTK
BRG
COG
SPEED OVER GROUND
DISTANCE
“ACTIVE TO”
WAYPOINT
GPS 135 Rev C 8/4/98 4:20 PM Page 94