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HDOP ........................... Indicates the accuracy of Horizontal position fixing.
The smaller the number shows the more accurate the
position fixing.
When the satellites are grouped together, HDOP
increases and position fixing accuracy is poorer. When
the satellites are Farther apart, HDOP decreases and
position fixing accuracy is enhanced.
Heading .......................... The direction in which the bows of a ship are pointing
expressed as an angular displacement from north.
HL .................................. Heading Line
Hull ................................ The exterior surface of a ship.
HUP(Head-UP) ............. Display mode in which the top of the screen
corresponds to the ships head maker.
Initialization ................... It takes up to 20 minutes for GPS position fixing
when it is used for the first time or after a master reset
has been performed. This time can be reduced by
entering initialization values such as estimated
position, time and antenna height.
IR ................................... Interference Rejector
Manual sequencing mode
....................................... The unit sounds the arrival alarm and the operator
will manually press key to step to next leg in the route
plan when it is safe to do so.
Master reset..................... A function for clearing all settings and returning to
the factory set values (default values). Two types of
master resets are provided. A soft reset clears all data
exept for waypoint and route plan data. A hard reset
clears all data.
NM ................................ Nautical Mile(1 nm= 1,852 m)
NMEA0183.................... National Marine Electrical Association 0183.
Association establishing international standards for
communications between navigational equipment and
the standard established by NMEA.
NUP(North-UP) ............ An azimuth stabilized display in which the top of the
screen is always North.
Off-course alarm ............. An alarm indicating that the vessel has deviated more
than a set distance from a predetermined course.
Port................................. Left (nautical term).
Position fixing ................. The process of deriving the current location of a vessel
using GPS or DGPS sensor.
Range ............................. The range scale.
Range ring ...................... Fixed range ring.
RM(Relative Motion) ..... The combination of relative course and relative speed.
RM display ..................... A display on which the position of own ship remains
fixed and all targets move relative to own ship.
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