11-7
This has the effect of rotating your desired track ring and hence rotating the desired track line on the map
screen using the destination point as a pivot. For example if you were approaching an airport from the
south west on an inbound heading of 070° but the runway in use at that airport was 09, it may be
desirable to approach the airport on a heading of 090° so that you were lined up for the approach.
By pressing the INC OBS Key you would increment the desired track setting from 070° to 090°. The CDI
would then show a fly left indication because you would be off track to the right from your new track line.
By turning left it would then be possible to intercept the new track line then fly straight into the airport on
the new approach heading.
If the joystick is touched, the display will immediately revert to Map format to allow full use of map
graphics. When the joystick is reset, Screen 47B will be reinstated. When flying with the CDI selected,
WPT ALERT messages and other warnings will be displayed in the CDI area.
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