Terrain Displays - Garmin G1000 NXi Pilot's Manual

6.3 TERRAIN DISPLAYS

WARNING: Do not use terrain avoidance displays as the sole source of information for maintaining
separation from terrain and obstacles. Garmin obtains terrain and obstacle data from third party sources
and cannot independently verify the accuracy of the information.
NOTE: Terrain data is not displayed when the aircraft is outside of the installed terrain database coverage
area.
NOTE: Terrain and obstacle alerting is not available north of 89º North latitude and south of 89º South
latitude. This is due to limitations present within the Terrain database and the system's ability to process
the data representing the affected areas.
NOTE: Terrain and obstacle alerting requires the Terrain-SVT or TAWS-B option. No terrain or obstacle
alerting occurs for the Terrain Proximity feature.
The terrain system increases situational awareness and aids in reducing controlled flight into terrain (CFIT) and
obstacles.
One of the following terrain systems is installed on this aircraft:
• Terrain Proximity
• Terrain-SVT (included with the Garmin SVT option when the Terrain Awareness and Warning System Class-B
(TAWS-B) is not installed; refer to the Flight Instruments section for more information about Garmin SVT.)
• TAWS-B (optional)
The installed terrain system provides color indications on map displays when terrain or obstacles, including
certain power lines, are within a certain altitude threshold from the aircraft. Terrain-SVT and TAWS-B furthermore
provide advisory visual annunciations and voice alerts to indicate the presence of threatening terrain or obstacles
relevant to the projected flight path. This alerting capability is not present in the Terrain Proximity feature.
Compared to Terrain-SVT alerting, TAWS-B uses more sophisticated algorithms to assess aircraft distance from
terrain and obstacles. The TAWS-B system includes more alerting capabilities than the Terrain-SVT system.
The terrain system requires the following for proper operation:
• Valid 3-D GPS position
• Valid terrain and obstacle databases
The terrain system uses terrain and obstacle information supplied by government and other sources. Terrain
information is based on terrain elevation information in a database that may contain inaccuracies. Individual
obstructions, such as towers or power lines, may be shown if available in the database. Garmin verifies the data
to confirm accuracy of the content. However, the displayed information should never be understood as being
all-inclusive and data may still contain inaccuracies.
The terrain system uses information provided from the GPS receiver to provide a horizontal position and
altitude. GPS altitude is derived from satellite measurements. GPS altitude is then converted to the height above
geodetic sea level (GSL), which is the height above mean sea level (MSL) calculated geometrically. The system
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