Navigation data24
BRG Bearing to Destination: Bearing to the destination from the boat.•
• BRG Bearing to cursor: Bearing to cursor from boat
CDI Course Deviation Indicator: When the boat is navigating to a point, the •
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 •
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 •
ground.
CTS Course To Steer: Optimum course to steer to return to the plotted •
course.
DTG Distance To Go: Distance from the boat to the destination.•
ETA Expected Time of Arrival: At the destination, assuming that SOG and •
COG remain constant.
• DST Distance from boat to cursor
SOG Speed Over Ground: Current boat speed over the ground. This is not •
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.•
TTG Time To Go: The estimated time to reach the destination.•
XTE Cross Track Error: The distance from the boat to the nearest point of the •
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 •
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)
CDI line
Plotted
course
CDI line