Using the Highway Page
The GPS 48’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 the
course deviation scale. The line down the middle of
the highway represents your desired track. As you navi-
gate 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
direction 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 CDI scale
setting normally appears. If you get too far off course
(the highway has disappeared), 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. 44.) As you approach a waypoint, a horizontal
“finish line” will move toward the bottom of the high-
way. When the finish line reaches the CDI scale, you’ve
arrived at your destination.
31
In this example, the
Highway Page indicates
that you are off course to
the right. Steer left 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 current
direction.
REFERENCE
Highway Page
If you get too far off
course, a message box will
appear to indicate what
course to steer to get back
on course most efficiently.
Bearing to
Waypoint
Graphic
Highway
CDI Scale
Distance to
Waypoint
User Selectable
Field
Speed Over
Ground
Track Over
Ground
Destination
Waypoint
GPS48revB.qxd 1/7/00 3:12 PM Page 31
