Garmin G950 Pilot’s Guide for the Pilatus PC-6
190-00870-02 Rev. A
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HAZARD AVOIDANCE
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
6.5 TERRAIN-SVS
WARNING:
Do not use Terrain-SVS information for primary terrain avoidance. Terrain-SVS is intended only
to enhance situational awareness.
NOTE:
Terrain data is not displayed when the aircraft is outside of the installed terrain database coverage
area.
NOTE:
Terrain-SVS is included with the optional Synthetic Vision Technology system (SVT). The TAWS-B
option will take precedence over Terrain-SVS when TAWS-B is also installed.
Terrain-SVS is a terrain awareness system included with the Garmin Synthetic Vision Technology System (SVT).
SVT functionality is offered as an optional enhancement. The optional Terrain Awareness and Warning System
- Class B (TAWS-B) or standard Terrain-SVS is integrated within SVT to provide visual annunciations and voice
alerts to indicate the presence of threatening terrain relevant to the projected flight path. For detailed information
regarding SVT, refer to the Additional Features section of this Pilot’s Guide.
Terrain-SVS does not comply with TSO-C151b certification standards. It increases situational awareness and
aids in reducing controlled flight into terrain (CFIT). Do not confuse Terrain-SVS with TAWS-B. TAWS-B is more
sophisticated and robust, and it is TSO-C151b certified. Although the terrain and obstacle color map displays
are the same, TAWS-B uses more sophisticated algorithms to assess aircraft distance from terrain and obstacles.
Terrain-SVS does not provide the following:
• Premature Descent Alerting (PDA)
• Excessive Descent Rate (EDR)
• Negative Climb Rate (NCR)
• 500 Foot Voice Callout alert (VCO)
Terrain-SVS requires the following components to operate properly:
• Valid 3-D GPS position
• Valid terrain/airport terrain/obstacle database
Terrain-SVS displays altitudes of terrain and obstructions relative to the aircraft position and altitude with
reference to a database that may contain inaccuracies. Terrain and obstructions are shown only if they are in the
database. Terrain and obstacle information should be used as an aid to situational awareness. They should never
be used to navigate or maneuver around terrain.
Note that all obstructions may not be available in the terrain and obstacle database. No terrain and obstacle
information is shown without a valid 3-D GPS position.
The G950 GPS receiver provides the horizontal position and altitude. GPS altitude is derived from satellite
position. GPS altitude is then converted to the height above geodetic sea level (GSL), which is the height above
mean sea level calculated geometrically. GSL altitude is used to determine terrain and obstacle proximity. GSL
altitude accuracy is affected by satellite geometry, but is not subject to variations in pressure and temperature that
normally affect pressure altitude sensors. GSL altitude does not require local altimeter settings to determine MSL
altitude. It is a widely-used MSL altitude source.
