Garmin G2000 Pilots Guide - Page 416

SySteM overvieW fliGHt inStruMentS Hazard avoidance settings to determine MSL altitude. It is a widely-used MSL altitude source. Therefore, GSL altitude provides a highly accurate and reliable MSL altitude source to calculate terrain and obstacle alerts. Terrain SVT terrain and obstacle databases are referenced to MSL. Using the GPS position and GSL altitude, Terrain SVT displays a 2-D picture of the surrounding terrain and obstacles relative to the position and altitude of the aircraft. Furthermore, the system uses GPS position and GSL altitude to calculate and project the aircraft's flight path in relation to the surrounding terrain and obstacles. In this manner, Terrain SVT can provide advanced alerts for predicted dangerous terrain and obstacle conditions. Baro-corrected altitude (or indicated altitude) is derived by adjusting the altimeter setting for local atmospheric conditions. The most accurate baro-corrected altitude can be achieved by frequently updating the altimeter setting to the nearest reporting station along the flight path. However, because actual atmospheric conditions seldom match the standard conditions defined by the International Standard Atmosphere (ISA) model (where pressure, temperature, and lapse rates have fixed values), it is common for the baro-corrected altitude (as read from the altimeter) to differ from the GSL altitude. diSPlayinG terrain Svt data Terrain SVT uses yellow (caution) and red (warning) to depict terrain and obstacles (with heights greater than 200 feet above ground level, AGL) alerts relative to aircraft altitude. The system adjusts colors automatically as the aircraft altitude changes. The colors and symbols in Figure 6-82 and Tables 6-12 and 6-13 represent terrain, obstacles, and potential impact points. eiS avoidance ManaGeMent audio & cnS fliGHt Hazard afcS additional featureS aPPendiceS Figure 6-82 Terrain Altitude/Color Correlation for Terrain SVT Unlighted Obstacle Height Lighted Obstacle Height < 1000' AGL > 1000' AGL < 1000' AGL > 1000' AGL Description Obstacle is red if 100' below current aircraft altitude or higher. Obstacle is yellow if between 100' below and 1000' below current aircraft altitude. Table 6-12 Terrain SVT Obstacle Colors and Symbology 402 Garmin G2000 Pilot's Guide for the Cessna T240 190-01263-01 Rev. A indeX