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Definition on Terms
2D(two- dimensional)..... Position fixing using satellites and height information.
3D(three-dimensional).... Position fixing using satellite information only from
four or more satellites.
Anchor alarm .................. An alarm indicating that the vessel has deviated more
than the set distance from a waypoint.
Arrival alarm ................... An alarm indicating that the vessel has come within
the set distance of a waypoint.
Automatic sequencing mode
....................................... Function that automatically steps from one waypoint
to the next when the arrival perpendicular point has
been detected.
Bow ................................ The front of a vessel (nautical term)
CDI ................................ Course Deviation Indicator. Information that
indicates the extent you have strayed from the route
intended and the direction to steer.
COG .............................. Course over Ground
CUP(Course-UP) ........... An azimuth stabilized display in which a line connect-
ing the centre of own ship with the top of the display
is own ship’s intended course.
Default value .................. Factory set value
DGPS ............................. The process of correcting the inaccuracies of GPS
position data from GPS satellites by receiving a beacon
Differential Signal from a base station whose exact
position is known. And which transmits correction
data for the GPS satellites it receives.
EBL(Electric Bearing Line)
....................................... Electronic Bearing Line – A moveable vector line
radiating out from the ship indicating the bearing
thereof.
GPS(Global Positioning System)
....................................... Internationally-used positioning system.
Ground stabilization ....... A mode of display whereby own ship and all targets
are referenced to the ground using ground track or set
and drift inputs.
GPS satellite ................... GPS stands for “Global Positioning System.” Several
satellites launched by the US Department of Defense
to establish a military navigational aid system.
Guard zone ..................... A zone in which an alarm is given when a target is
detected.
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