Garmin GNC 420W Pilots Guide - Page 181

SECTION 10 TERRAIN SECTION 10: TERRAIN NOTE: Not all GNC 420 units are equipped with or configured for TERRAIN. See the 400-series Installation Manual (190-00140-02) for TERRAIN configuration information. 10.1 Introduction Garmin TERRAIN is a non-TSO-C151b-certified terrain awareness system incorporated into GNC 420 units to increase situational awareness and aid in reducing controlled flight into terrain (CFIT). TERRAIN functionality is a standard feature found in GNC 420 units with main software version 5.01 or above, along with appropriate hardware upgrades. Operating Criteria TERRAIN requires the following to operate properly: • The system must have a valid 3-D GPS position solution. • The system must have a valid terrain/obstacle/ airport terrain database. Limitations NOTE: The data contained in the TERRAIN databases comes from government agencies. Garmin accurately processes and cross-validates the data but cannot guarantee the accuracy and completeness of the data. TERRAIN displays terrain and obstructions relative to the altitude of the aircraft. The displayed alerts are advisory in nature only. Individual obstructions may be shown if available in the database. However, all obstructions may not be available in the database and data may be inaccurate. Never use this information for navigation or to maneuver to avoid obstacles. Terrain information is based on terrain elevation information in a database that may contain inaccuracies. Terrain information should be used as an aid to situational awareness. Never use it for navigation or to maneuver to avoid terrain. TERRAIN uses terrain and obstacle information supplied by government sources. The data undergoes verification by Garmin to confirm accuracy of the content, per TSO-C151b. However, the displayed information should never be understood as being all-inclusive. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 10-1