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EchoMap v3.0
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positioned below the heading indicator. If there is no GPS altitude
available, this area will display as a red and white slashed
bar that
says NO ALT or NO GPS. Terrain and tower alert conditions are
always calculated, even when terrain and towers are not being
displayed on the map.
3.6.1 Terrain Alert Indicator
Echomap will display a terrain alert icon if there
is terrain within 8 minutes ( based on your
current GPS ground speed ) and 500 ft of your
current altitude. Although the terrain alert
indicator is always enabled, you have the
option of deciding whether or not you want to view the color
coded areas of conflicting terrain on the moving map as shown on
the next page.
EchoMap provides advisory worldwide terrain elevation data. The
terrain database is derived from the USGS GTOPO30 global digital
elevation model (DEM). Elevations are regularly spaced at 30-arc
seconds (about 1 Km). Elevations are stored in 100ft increments
to save disk space. The terrain data may contain some degree of
error (especially outside of the United States). By rounding up to
the nearest 100ft, we help to insure that the error is on the side of
caution. It is possible that some terrain features will not be
depicted in the data. Terrain data should never be used for
primary surface navigation
3.6.2 Tower Alert Indicator
Echomap will display a tower alert icon if there
is a tower within 8 minutes ( based on the
current GPS ground speed ) and 500 ft of your
current altitude. The tower alert function is
always enabled, and if there is a conflict the
obstacles are automatically displayed on the
moving map with the same color coding shown for terrain.
3.6.3 Terrain Alert Display