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JLR-7700 MK2GPS Navigator
Key Terms
Term Description
GPS satellites The term is an acronym that represents the Global Positioning System,
which is managed by the US Department of Defense to support its
navigation aid system.
DGPS The term is an acronym that represents the Differential Global
Positioning System, which is a system to improve the position fixing
accuracy by receiving the correction data with a beacon receiver for a
given GPS satellite, which is transmitted by the beacon station with a
known position.
Position fixing The term means to obtain the current position of your vessel with the
GPS or DGPS receiver.
2D (Two-dimensional position fixing) The term 2D means the position fixing with data obtained from the satel-
lites and antenna height information.
3D (Three-dimensional position fixing)
The term 3D means the position fixing with four or more satellites infor-
mation only.
HDOP The term is an acronym that represents the Horizontal Dilution of
Precision, which reflects the position fixing accuracy. The accuracy
increases as the value decreases.
The value increases when the satellites are gathered close to each other,
and it reduces when the satellites are spattered, which in turn means
increased accuracy.
Loran time difference display This is a method to display the current position using the time difference.
(This method is recommended for the experts who have good knowl-
edge on the Loran navigation method.)
TD The term is an acronym that represents the Time Difference, which is
equal to the time difference between the master and secondary Loran
signals.
Route plan This is the plan that consists of the multiple waypoints registered in the
order of navigation.
CDI The term is an acronym that represents the Course Deviation Indicator,
which includes information on the deviation from a given planned course
and direction to be steered.
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