Garmin GNS 480 Installation Manual

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Post-Installation Configuration & Checkout3-30 560-0982-01 Rev A GNS 480 (CNX80) Installation Manual3.3.2 SYSTEM CHECKOUT – GROUND CHECKSThe GNS 480 includes a self test that is executed every time the unit is turned on that checks the unitoperation as well as other internal functions. Verify that the unit does not display a failure indicationwhen turned on.NOTEThe GNS 480 must be properly configured prior to performing system checkouts. Whenconfigured correctly, the GNS 480 will annunciate failures that are detected withinterfacing systems when it is first turned on. Any annunciated failures should becorrected prior to proceeding with the ground checks.3.3.2.1 GPS Navigation CheckoutSwitch on the GNS 480 in the normal mode to complete this part of the checkout – this is accomplishedby either exiting the Ground Maintenance Mode or by turning the GNS 480 OFF and then turning it backON.The GNS 480 requires a “seed” position, time, and date for the GPS sensor to know which satellites tolook for. Once this information is entered it will be saved and updated automatically, so it will not benecessary to re-enter the information at every start-up. If the GNS 480 is moved a great distance withoutbeing turned on, the seed position may have to be re-entered.NOTEThis checkout must be completed with the aircraft moved away from hangars and otherstructures that may obstruct the view of the satellites.3.3.2.1.1 Initial Power-UpThe first time the GNS 480 is used after it is installed, the GPS seed position, UTC time and date must beentered. Following the display of the main start-up screen, the screen shown in Figure 3-30 will bedisplayed for 10 seconds. Press the CHG smart key to allow the position to be edited. The latitude(degrees) will be highlighted. Use the large, outer knob to select the next or previous editable data fieldand turn the small, inner knob to change the current setting. When the position, UTC time and date havebeen entered, press the MENU/ENTER key to accept the entries. The Master GPS Reset must be set to‘No’.NOTEThe latitude and longitude must be within one degree of the actual position, and the UTCtime (not local time) must be within one minute. If position, time and date are notentered correctly, GPS acquisition may take up to 20 minutes.