100 RayChart 620
Soft key A key without a printed label, whose function
depends on the context in which it is used. The
current function is indicated by a label on the screen
immediately above the soft key.
Relative Motion The mode in which the chart moves to keep the
vessel’s location in the centre of the display.
Time out The automatic clearing of a message or the soft key
labels after 7 seconds.
True Motion The mode in which the chart remains fixed and the
vessel moves across the display. This is the normal
display mode.
Variation The difference in degrees between “True North” and
“Magnetic North”.
Waypoint Any location that has been stored in memory with
Lat/Long or TD as the coordinates, which is to be
used as a destination or a turning point on the route
to the destination.
Window A boxed area inset on the main screen, containing
information.
G.2 Abbreviations
BDI Bearing Deviation Indicator
BTW Bearing To Waypoint
CDI Course Deviation Indicator
CMG Course Made Good
COG Course Over Ground. The actual direction of your vessel’s
calculated movement over the ground.
dGPS Differential Global Positioning System
DMG Distance Made Good
DTG Distance To Go
EMC Electro-Magnetic Compatibility
ETA Estimated Time of Arrival
GPS Global Positioning System
HDOP Horizontal Dilution Of Precision. The multiplicative factor
that modifies ranging error. It is caused solely by the
geometry between your vessel and your set of satellites.
MOB Man OverBoard
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