Cub Crafters CC18-180 Pilot Operating Handbook page 432

SECTION 9.14 CUB CRAFTERS
SUPPLEMENTS-GTN 635 CC18-180
9.14.4 EMERGENCY PROCEDURES
9.14.4.1 ABNORMAL PROCEDURES
9.14.4.1.1 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.
If Alternate Navigation Sources (ILS, LOC, VOR, DME,
ADF) Are Available:
Navigation ........................... USE ALTERNATE SOURCES
If No Alternate Navigation Sources Are Available:
DEAD RECKONING (DR) MODE:
Navigation ........................................................... USE GTN
REPORT TC10000AFM
Issued: 02/05/13
Page number 9-14-16 Date of revision: N/A