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Using the Compass Page
The GPS 38’s Compass Page provides graphic steering
guidance to a destination waypoint. The bearing (BRG) and
distance (DST) to the waypoint are displayed at the top of
the page, right below the destination waypoint field. The
distance displayed is always the straight line distance from
your present position to the destination waypoint. The
bearing indicates the exact compass heading from you to
the destination.
The middle of the page features a rotating “compass” that
shows your current heading while you’re moving (desire d
track up), with a pointer arrow in the center. The arrow shows
the direction of your destination from the direction you are
moving. If the arrow points any direction other than up (left,
right, down, etc.), turn toward the arrow until it points up
and then continue in that dire c t i o n .
The bottom of the Compass Page displays your curre n t
track (TRK) and speed (SPD) over the ground, while the CDI
(course deviation indicator) scale shows how far you are off
course. The diamond in the center of the CDI scale re p re s e n t s
your present position, while the d-bar (the moving vert i c a l
line on the scale) indicates the direction and distance you are
o f f the desired straight line course.
To stay on course, steer toward the d-bar until it is cen-
t e red on the position diamond. The default setting of the CDI
scale is +/- 0.25 miles, with each mark re p resenting 0.05 miles
of course deviation. If you do get off course by more than the
selected scale, an arrow prompt will appear at the end of the
scale to indicate the direction you are off course. When you
a r e one minute away from the destination (based on your cur-
rent speed and track over the ground), the GPS 38 will alert
you with a flashing on-screen message box.
In this example, the
Compass Page indicates
that you are traveling in a
northwest (305º) direction
and the destination way-
point is southwest (252º) of
your current direction of
travel.
In this example, the
Compass Page indicates
that you are traveling in a
westerly (255º) direction
and the destination way-
point is slightly northwest
(286º) of your current
direction of travel.
R E F E R E N C E
Compass Page
38
Bearing to
Waypoint
Pointer to
Waypoint
Speed Over
Ground
Destination
Waypoint
Track Over
Ground
CDIScale
Distance to
Waypoint
Graphic
Compass
GPS 38 Man Rev B 7/23/98 4:33 PM Page 38