Garmin GTN 725 STC GTN 6XX/7XX AFMS - Page 21

GARMIN Ltd. or its Subsidiaries, c/o Garmin International 1200 E. 151st Street Olathe, KS 66062 USA AIRPLANE FLIGHT MANUAL SUPPLEMENT or SUPPLEMENTAL AIRPLANE FLIGHT MANUAL for STC SA02019SE-D GARMIN GTN NAVIGATION SYSTEM 3.2 Abnormal Procedures 3.2.1 LOSS OF GPS/SBAS NAVIGATION DATA When the GPS/SBAS receiver is inoperative or GPS navigation information is not available or invalid, the GTN will enter one of two modes: Dead Reckoning mode (DR) or Loss Of Integrity mode (LOI). The mode is indicated on the GTN by an amber "DR" or "LOI". If the Loss Of Integrity annunciation is displayed, revert to an alternate means of navigation appropriate to the route and phase of flight. If the Dead Reckoning annunciation is displayed, the map will continue to be displayed with an amber 'DR' overwriting the ownship icon. Course guidance will be removed on the CDI. Aircraft position will be based upon the last valid GPS position, then estimated by Dead Reckoning methods. Changes in true airspeed, altitude, heading, or winds aloft can affect the estimated position substantially. Dead Reckoning is only available in Enroute and Oceanic modes. Terminal and Approach modes do not support Dead Reckoning. 190-01007-A2 Rev. 1 FAA APPROVED DATE: _M__A_R_C_H__1_8__,_2_0_1_1__ Page 21 of 31