points and the Wind Flag. The current traveling direction (bearing) corresponds to the point indicated in
the top of the navigation circle. On the example shown in Figure 3.5, the bearing is approximately 80
º
.
Navigation Arrows
. If no route is dened the arrow will start showing the direction to the takeo, after the takeo is detected
(TakeO is the point taken when the Flight Starts)
Figure 3.6: Route Optimisation
When a route is active the
direction of next waypoint
(WP1) is pointed by an arrow (larger arrow 1). If
no route is dened the arrow will start showing the direction to the takeo, after the takeo is detected
(TakeO is the point taken when the Flight Starts). Small course corrections are sometimes required and
these are shown on the GPS SD+ by a
ne adjustment indicator
in the form of a small arrow 4. Arrow 4
to the left means the pilot should turn slightly to the left, and inversely arrow 4 to the right indicates a
small adjustment to the right is needed.
When the course is perfect, i.e. less than 1
º
o, the GPS SD+ indicates this by showing a large arrow
forward (Figure 3.7).
Figure 3.7: Perfect Heading
Thermal Core Map
Another useful feature of the Navigation Circle Element is the thermal core map. This map corresponds to
a black dot which is shown inside the inner navigation wheel (together with the navigation arrows).During
a thermal climb the GPS SD+ keeps track of the strongest climb values point for each 50m layer. The
point of strongest lift is then graphically represented by the black ball in the inner Navigation Circle,
showing where the thermal core is relative to the pilot's position. The position of the dot (thermal core)
is constantly updated as the pilot moves. When the pilot is over 300m from the thermal core the dot will
be at the edge of the circle. As the pilot moves closer to the thermal core the dot will move towards the
center.
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