point on the list. The distance to the start will become highlighted when the pilot is in an irregular
position, i.e. inside a start cylinder where he should be out or vice-versa.
Thermal Core Map
Another useful feature of the Navigation Circle Element is the thermal core map. This map corre-
sponds to a black dot which is shown inside the inner navigation wheel (together with the navigation
arrows).During a thermal climb the NAV 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.
Figure 3.8: Thermap Core Map
In Figure
3.8
the thermal core is currently behind the pilot at a distance of approximately 150
meters (half of 300 m wheel radius).
3.1.6
Airspaces
The airspace element provides information to the user relative to specific three-dimensional objects
of the atmosphere, previously loaded to the instrument. Each of this objects can be an airspace
area. Airspace information can loaded to the instrument using the Flymaster Designer software (see
Designer user manual for more information). The NAV only accepts data in the ?OpenAir? format,
and it has a limitation of 3000 polygons points. (See http://www.gdal.org/ogr/drv_openair.html
for more information about the open air format).
Figure 3.9: Airspace Element
When the element of Figure
3.9
is inserted in a layout using DESIGNER, a 2D map (box) is
shown on the instrument. On the bottom left of the map the scale is indicated in Km, and on the
centre of the map is an arrow (see Figure
3.10
). This arrow represents the pilot position, and its
orientation indicates the bearing of the movement. The map has always a
North Up
orientation.
The first time the map is drawn, it is centred on the last GPS position the NAV has in its memory.
The map is re-centred once the flight starts i.e. when a valid gps signal exists, and the
start speed
(see Section
13.5.6
) is reached.
Once the flight starts, the map is redrawn with an arrow (representing the pilot) which will
move around the map, indicating the relative position of the pilot to each of the airspace areas. If
15
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