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Understanding the
steering screen
displays
961 Operations and Reference Manual Rev. D
Cross-track error (XTE)
The lower part of either steering screen displays XTE using
your vessel's symbol to illustrate distance from the black
course line. XTE is the distance between your position and
your course line; that is, how far off you are from your
intended course line. XTE is displayed both numerically and
graphically.
On the 3-D STEER screen, the yellow dashed lines on either
side of the black course line represent the maximum distance
your vessel can travel from the course line before the
cross-track alarm sounds. To set the distance for this alarm,
see "Changing alarm settings" starting on page 12-6.
In addition, the orientation of your black vessel symbol indi-
cates the direction you're actually travelling (which may not
be the same as your heading if any current or wind is present):
•
when the black vessel points parallel to the course line,
you're keeping a constant distance from the line
•
when the black vessel points away from the course line,
you're moving farther from the line
•
when the black vessel points toward the course line,
you're moving closer to the line
When XTE exceeds the scale, the black vessel symbol flashes.
To set the XTE distance, see "Cross-track error scale" starting
on page 13-3.
Distance and bearing
The 961 displays distance and bearing from your vessel's posi-
tion to the waypoint.
Speed-over-ground (SOG) and course-over-ground (COG)
Your SOG is the actual speed of your vessel relative to your
progress over the surface of the earth. Your COG is the actual
path, in degrees true or magnetic, that your vessel travels over
the surface of the earth.
Chapter 10 - Waypoint and Route Navigation
Page 10-5
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