The Clear Key may be pressed to toggle the OBS between To and From
indications. In the previous diagram, the OBS setting was 090T. By
pressing the Clear Key, the following OBS setting of 270F is obtained.
The OBS setting will remain set to the initial bearing or radial until
otherwise changed. The CDI needle will continuously update to show
the deviation from the selected radial or bearing as the aircraft moves.
To enter a desired bearing or radial, press the OBS Key. The OBS
setting will begin to flash. Enter the desired three digit radial or
bearing using the Numeric Keypad. For example, OBS 0 3 0 will
enter 30 degrees as the OBS setting. The CDI will automatically
display the deviation from the selected bearing or radial. This process
may be exited any time prior to entering the third digit by pressing the
Clear Key. As long as the OBS setting is flashing, the SP-200 will
accept numeric inputs between 0 and 360. Once three digits have
been entered, or five seconds pass without an entry being completed,
the SP-200 will not accept additional input until the OBS Key is
pressed again.
Another method of selecting an OBS setting is using the Up and
Down Keys. Once the OBS Key is pressed and the OBS setting is
flashing, the Up or Down Key may be used to scroll through all 360
degrees until the desired radial or bearing is selected. Input from the
Up or Down Key is accepted as long as the OBS setting is flashing.
Once the desired bearing or radial is selected, the flashing will
“time out” after five seconds.
The CDI needle may be centered and the actual bearing to or radial
from the selected VOR station may be displayed at any time by
pressing the OBS Key followed by the Clear Key. Pressing the Clear
Key any time the OBS setting is flashing will center the CDI.
Remember, any time the OBS Key is pressed, the OBS setting will
flash. During this time the SP-200 will accept three digits, the UP or
Down Key or the Clear Key to change the OBS setting.
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270F117.000
SP-200 BOOKLET 9/28/04 5:46 PM Page 24
