The rst time the map is drawn, it is centred on the last GPS position the LIVE SD has in its memory.
The map is re-centred once the ight starts i.e. when a valid gps signal exists, and the start speed (see
Section
4.10.5
) is reached.
Note: After new Airspace data is uploaded to the LIVE SD it can only be seen on the Map
after the Flight Starts.
Once the ight 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 the pilot is outside
a visible airspace area then a gray line is used to draw the area, whereas if the pilot is inside the airspace
then a black line is used instead. Note that being inside a airspace area (2D) does not mean that the
airspace is being violated, since the pilot can be above, or below the dened 3D shape. In order to have
more information about possible airspaceÂs violation, some data elds should be added to the layout.
This data elds are Distance to CTR, Altitude to CTR, and CTR Status (Figure
3.10
).
The Dist. CTR data eld shows the shortest horizontal distance to the nearest airspace line. This distance
is always positive. Similarly, the Alt. To CTR shows the shortest vertical distance to nearest airspace line.
Unlike the horizontal distance, the vertical distance can be negative. A positive vertical distance indicates
that you are outside the airspace, whereas a negative distance indicates that you are inside the airspace.
Additionally, the CTR status eld will indicate if an airspace is being violated by displaying Violating.
If the pilot is not violating the airspace but it is inside a predened margin then the messages Altitude
Imminent, or Position Imminent will be shown.
Figure 3.10: Airspace Map and Associated Data Fields
When the page contains an airspace map element, the UP, and DOWN keys, can be used to change the
map scale: pressing the UP key will decrease the scale, and the DOWN key will increase the scale. The
corresponding user dened key function will be disabled.
3.1.8 Altitude graph
The Altitude graph element (Figure
3.11
) corresponds to a graph of barometric altitude versus time.
Altitude is shown in the vertical axis graduated in meters with time shown on the horizontal axis graduated
in seconds.
Figure 3.11: Altitude Graph Element
14
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