190-02488-01 Rev. B Pilot’s Guide 2-63
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SBAS Providers
Operating with SBAS active outside of the service area may cause elevated EPU values
to display on the status page. Regardless of the EPU value displayed, the LOI
annunciation is the controlling indication for determining the integrity of the GPS
navigation solution.
GPS Status Annunciations
Once the GPS receiver determines the aircraft’s position, the unit displays position,
altitude, track, and ground speed data. GPS status annunciates under the following
conditions.
PROVIDER SERVICE AREAS
EGNOS
Most of Europe and parts of North Africa.
GAGAN
India
MSAS
Japan only.
WAAS
Alaska, Canada, the 48 contiguous states,
and most of Central America.
ANNUNCIATION CONDITION
Acquiring
GPS receiver uses last known position and satellite orbital
data (collected continuously from satellites) to determine
which satellites should be in view.
3D Nav
3-D navigation mode. GPS receiver computes altitude
using satellite data.
3D Diff Nav
3-D navigation mode. Differential corrections from SBAS
provider are in use.
LOI
Satellite coverage is insufficient to pass built-in integrity
monitoring tests.
SBAS supports wide area or regional augmentation through the
use of additional satellite broadcast messages.
Tap this key and select from the list of providers.
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