IFD400 Series Pilot Guide
4-84 Aux Subsystem
NOTE
Global SBAS Support
Wide area/regional satellite based augmentation
system (SBAS) support provided by the IFD include
WAAS (Continental US, Alaska, Canada and most
of Central America), EGNOS (most of Europe and
North Africa), MSAS (Japan) and GAGNAN (India).
These are regional augmentations of the GPS
satellite constellation and should not be interpreted
as meaning the IFD is compatible with other GNSS
constellation systems such as Galileo (Europe),
GLONASS (Russia), or Compass (China).
The GPS navigation states possible are:
System performing self test. This is
the initial state value but happens so
quickly it is rarely observed.
System is initializing – this state is
also very quick and is rarely
observed.
Satellite acquisition mode.
System has acquired enough
satellites to conduct basic navigation
but without integrity.
System has acquired enough
satellites to conduct navigation with
fault detection and exclusion
integrity.
System is capable of navigation with
satellite-based augmentation (e.g.
the WAAS platform in the US).
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