Garmin GNC 420W Pilots Guide - Page 234

SECTION 13 - MESSAGES, ABBREVIATIONS, & NAV TERMS Message Description Poor GPS coverage The GPS receiver cannot acquire a sufficient number of satellites to compute a position and provide navigation. Power down and reinitialize The GNC 420 cannot calculate a position due to abnormal satellite conditions. The unit is unusable until power has been cycled off and back on. Abnormal satellite conditions may exist, an alternate means of navigation may be needed. RAIM is not available Receiver Autonomous Integrity Monitoring (RAIM) has determined that sufficient GPS satellite coverage does not exist for the current phase of flight. (The CDI/HSI NAV flag also appears.) Select an alternate source for navigation guidance. RAIM not available from FAF to MAP waypoints When performing an instrument approach, Receiver Autonomous Integrity Monitoring (RAIM) has determined that sufficient GPS satellite coverage does not exist to meet the required protection limits. Select an alternate source for navigation guidance. Although sufficient GPS satellite coverage may exist, Receiver Autonomous Integrity Monitoring (RAIM) has determined the information from one or more GPS satellites may RAIM position warning be in error. The resulting GPS position may be in error beyond the limits allowed for the current phase of flight. Cross-check the position with an alternate navigation source. If the warning occurs during a final approach segment (FAF to MAP), execute the published missed approach. Scheduler message -- The user-entered scheduler message time has expired, and the scheduler message is [user entered text] displayed. Searching the sky The GNC 420 is searching the sky for GPS satellite almanac data or the GPS receiver is in AutoLocate Mode. Allow the unit to complete data collection (approximately five minutes) before turning it off. Select auto sequence mode The OBS Key was pressed, disabling auto sequencing of waypoints (in a flight plan or instrument procedure). The OBS Key should be pressed again to enable auto sequencing, because 1) no destination waypoint has been selected or 2) the GPS receiver cannot currently determine its position. Set course to [###]° The course select for the external CDI (or HSI) should be set to the specified course. The message only occurs when the current selected course is greater than 10° different from the desired track. Steep turn ahead This message appears approximately one minute prior to a turn in one of the following three conditions: 1) the turn requires a bank angle in excess of 25° in order to stay on course, 2) the turn requires a course change greater than 175°, or 3) during a DME arc approach the turn anticipation distance exceeds 90 seconds. 13-6 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K