Garmin GNS 480 Installation Manaul page 119

3.3.2.4.7 SL30 NAV/COM Checkout
When SL30 NAV tuning is provided to the GNS 480, the GNS 480 will output Distance, Speed, and Time
(DST) information via the MapCom output (the GNS 480 also provides COM/NAV frequency
information from its database). This check verifies that the units are communicating. Ensure that the GNS
480 and SL30 are turned on and in normal mode, and that the GNS 480 has a valid position. If the
following steps do not perform correctly, check the electrical connections and configuration setup.
1. Operate the SL30 in NAV mode.
2. Press the SL30 SEL button to bring up the NAV frequency recall lists.
3. Turn the SL30 large knob clockwise until the nearest VOR list is displayed (the identifier and
frequency of the nearest VOR station will be displayed).
4. Press the SL30 flip-flop (↔) button to swap the listed VOR frequency to the active frequency.
5. Press the SL30 SEL button and turn the SL30 large knob one click counterclockwise to show the DST
display prompt. If you do not see S
SL30 and GNS 480 are not communicating over the serial interface.
3.3.2.4.8 Compass System
The GNS 480 can receive heading from an external source (XYZ synchro, FADC, or ARINC 429 heading
source). This check verifies that the GNS 480 is receiving data from the compass system. Ensure that the
GNS 480 and compass system are turned on the heading is valid. If the following steps do not perform
correctly, check the electrical connections and configuration setup.
1. Press the MAP bezel key and use the large, outer knob to select MAP 2.
2. Press the MENU/ENTER key to display the line select key functions, and repeatedly press the MORE
line select key until the NAV DATA line select key legend is displayed.
3. Press the NAV DATA line select key to display nav data in the window on the left.
4. The HDG field will display the magnetic heading. If the HDG field is not displayed, press the SEL
DATA line select key and use the small, inner knob to select the HDG field for display and press
MENU/ENTER when the appropriate field is selected. Verify that this heading value is not dashed
out, and that the heading agrees with the HSI (±2°).
3.3.2.4.9 Autopilot
The GNS 480 provides GPSS roll steering information to an appropriate autopilot. When connected
properly, the autopilot will show a GPSS valid indication when the GNS 480 has a valid GPS position and
is navigating to a waypoint.
Some autopilots require that groundspeed be above a certain threshold in order for GPSS
to be valid. This is accomplished by placing the GNS 480 in Simulator Mode.
This check verifies that the autopilot is receiving data from GNS 480. Ensure that the autopilot is turned
on and in normal mode. If the following steps do not perform correctly, check the electrical connections
and configuration setup.
1. Apply power to the equipment, and after the GNS 480 splash screen clears press the SUSP bezel key
on the GNS 480 three times to go into Simulator Mode. Press the MENU/ENTER key to
acknowledge entry into the Simulator Mode. Allow the GNS 480 to complete its normal start-up
sequence.
2. In the GNS 480, set a course to a destination waypoint. This can be done by pressing the NRST bezel
key to display a list of nearby waypoints. Then use the large, outer knob to select a suitable waypoint
and press the DIRECT-TO bezel key, followed by the Direct line select key.
GNS 480 (CNX80) Installation Manual
Post-Installation Configuration & Checkout
DST D , either the feature is disabled on the SL30 or the
HOW ATA
NOTE
560-0982-01 Rev L 3-39