Simrad NX40/45 Installation and Operation Manual
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Navigation data
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BRG
Bearing to Destination: Bearing to the destination from the boat.
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•
BRG
Bearing to cursor: Bearing to cursor from boat
CDI
Course Deviation Indicator: When the boat is navigating to a point, the
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chart and highway windows show a parallel line on either side of the plotted course.
These two lines are called the Course Deviation Indicator (CDI) lines. The distance
from the plotted course to a CDI line is the CDI scale.
Set the CDI scale to the maximum distance that the boat should deviate from the
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plotted course. The chart and highway windows show the CDI lines, which are like
a highway over the water where the boat will move. The windows show how far the
boat has deviated from the plotted course and if the boat is approaching a CDI line.
If the XTE alarm is enabled an alarm will sound if the boat reaches a CDI line.
COG
Course Over Ground: Direction in which the boat is moving over the
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ground.
CTS
Course To Steer: Optimum course to steer to return to the plotted
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course.
DTG
Distance To Go: Distance from the boat to the destination.
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ETA
Expected Time of Arrival: At the destination, assuming that SOG and
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COG remain constant.
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DST
Distance from boat to cursor
SOG
Speed Over Ground: Current boat speed over the ground. This is not
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necessarily the same as the boat speed through the water nor the speed at which
it is approaching the destination.
STR
Steering: The difference between COG and CTS.
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TTG
Time To Go: The estimated time to reach the destination.
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XTE
Cross Track Error: The distance from the boat to the nearest point of the
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plotted course. XTE may have a letter: R means steer to the right to return to the
plotted course, L means steer to the left.
VMG
Velocity Made Good: The speed at which the boat is approaching the
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destination.
CTS
SOG (speed)
VMG (speed)
BRG
COG
Destination
Boat position
Start
STR
DTG
(distance)
CDI scale
(distance)
Plotted
course
Start
Destination
XTE
(distance)
Boat
position
CDI scale
(distance)
C
D
I l
in
e
Plotted
course
C
D
I l
in
e