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Using the Highway Page
The GPS 12’s Highway Page provides graphic steer-
ing guidance to a destination waypoint, with a greater
emphasis on the straight-line desired course and the
distance and direction you are off course. The bearing
and distance to a waypoint—along with your current
track and speed—are displayed at the top of the screen.
As you head toward your destination, the middle of
the screen provides visual guidance to your waypoint
on a moving graphic “highway.” Your present position is
represented by the diamond in the center of a course
deviation indicator (CDI) scale. The line down the mid-
dle of the highway represents your desired track. As you
navigate toward a waypoint, the highway will actually
move—indicating the direction you’re off course—rela-
tive to the position diamond on the CDI scale. When
the highway is pointing straight up the screen, the way-
point is directly ahead. If the destination waypoint is to
the left, the top of the highway will lead to the left, and
vice versa. To stay on course, simply steer in the direc-
tion the highway leads (left or right) until the highway
leads straight up the page.
If you do get off the desired course by more than
1/5th of the selected CDI range, the exact distance you
are off course will be displayed where the CDIscale set-
ting normally appears. If you get too far off course (the
highway has disappeared off either side of the highway
display), a message box will appear to indicate what
course to steer to get back on course. (For information
on how to set this scale, see pg. 45.) As you approach a
waypoint, a horizontal “finish line” will move toward
the bottom of the highway.
When the finish line re a c h e s
the CDI scale, you’ve arrived at your destination.
Highway Page
REFERENCE
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In this example, the
Highway Page indicates
that you are off course to
the left. Steer right to get
back on course. Notice the
highway always shows the
direction to turn. If the
highway leads straight up
the page, you should con-
tinue in your curre n t
direction.
If you get too far off
course, a message box will
appear to indicate the
most efficient heading to
get you back on course.
Bearing to
Waypoint
Graphic
Highway
Display
CDI Scale
Distance to
Waypoint
User Selectable
Field
Speed Over
Ground
Track
Destination
Waypoint
GPS12B 1/13/99 4:28 PM Page 34