Garmin GNC 420W Pilots Guide - Page 229

SECTION 13 - MESSAGES, ABBREVIATIONS, & NAV TERMS SECTION 13: MESSAGES, ABBREVIATIONS, AND NAV TERMS 13.1 Messages The GNC 420 uses a flashing 'MSG' annunciator at the bottom of the screen (directly above the MSG Key) to alert the pilot of any important information or warnings. While most messages are advisory in nature, warning messages may require pilot intervention. When the 'MSG' annunciator flashes, press the MSG Key to display the message. Press the MSG Key again to return to the previous page. The following is a list of available messages and their meanings: Message Airspace ahead -- less than 10 minutes Airspace near and ahead All data referenced to True North Altitude input failure Approach is not active Approaching target altitude Description The GPS-calculated course is projected to enter a special use airspace within 10 minutes. This message is automatically disabled within 30 nm of an arrival airport, when an approach is loaded. The GPS-calculated position is within 2 nm of the boundary of a special use airspace and the course is projected to enter the airspace within 10 minutes. This message is automatically disabled within 30 nm of an arrival airport, when an approach is loaded. The GNC 420 has not detected a NavData Card in the left data card slot. The GNC 420 is configured to receive altitude serializer data (Icarus, Rosetta, or Shadin) and it is not being received. Or, the data was being received, but has been interrupted. If a grey code altitude input is available, it is used instead. If the problem persists, contact a Garmin dealer and check the installation and installation settings. When this message occurs, no pilot action is required if enough satellites are available for a 3D position fix (provided no RAIM warnings are present). However, if only a 2D position fix is possible, the pilot should maintain the GPS altitude within 1,000 feet of pressure altitude by entering the altitude on the Position Page. The approach could not transition to 'active', at 2 nm or closer to the FAF. Verify that 'SUSP' does not appear directly above the OBS Key, indicating the auto waypoint sequencing is suspended. This message also appears if Receiver Autonomous Integrity Monitoring (RAIM) has determined that sufficient GPS satellite coverage does not exist for the current phase of flight (along with a 'RAIM not available from FAF to MAP' message). The current GPS-computed altitude is within 500 feet of the final Vertical Navigation target altitude. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 13-1