Garmin GNC 420W Pilots Guide - Page 231

SECTION 13 - MESSAGES, ABBREVIATIONS, & NAV TERMS Message Description COM transmitter power has been reduced The GNC 420 has detected excessive unit temperature and/or an insufficient voltage level. The COM transceiver transmit power has been automatically reduced to compensate for the condition. For excessive temperatures, check for adequate ventilation or check cooling air flow. If the message persists, contact a Garmin dealer for assistance. Data card failure The GNC 420 has detected a problem with the NavData Card. The data is not usable and the card should be returned to Jeppesen or to a Garmin dealer. Data transfer cancelled (crossfill is busy) An attempt to transfer flight plan data during a unit-to-unit crossfill was cancelled. The host unit is busy or unable to communicate. Wait until any previous crossfill operation is complete before attempting the transfer again. Data transfer cancelled (data invalid) An attempt to transfer a single user waypoint during a unit-to-unit crossfill was cancelled. No waypoint was specified on the Crossfill Page. Select a user waypoint and attempt the transfer again. Data transfer cancelled (version mismatch) An attempt to transfer data during a unit-to-unit crossfill was cancelled. The database versions of the two GNC 420s are not identical. If necessary, update the database(s) so they match. Contact Jeppesen or a Garmin dealer for assistance. Data transfer error, please re-transmit An error was detected during unit-to-unit crossfill of user data (user waypoints and/or flight plans). The data transfer should be attempted again. Data transfer is complete The unit-to-unit crossfill of user waypoint data has finished. Database changed, validate user modified procedures The pilot has modified one or more approaches, departures, or arrivals from their original published form. When the NavData Card is replaced (database update), manually verify the changes in the new database. This message occurs each time a flight plan containing a modified procedure (generated from a prior database version) is activated. To eliminate the message, re-create the flight plan from the new database, then make the desired modifications. Degraded accuracy GPS position accuracy has been degraded and RAIM is not available. Poor satellite geometry (or coverage) has resulted in a horizontal DOP greater than 4.0. Additional cross-checking using another navigation source is required to verify the integrity of the GPS position. Display backlight failure The GNC 420 has detected a failure in the display backlighting. The unit should be taken to a Garmin dealer for service. Do not use for navigation The GNC 420 is in Demo Mode and must not be used for actual navigation. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 13-3