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Under FAR parts 91, 121, 125, and 135, the FDE availability prediction program must be
used prior to all oceanic or remote area flights using GTN Xi as a primary means of
navigation.
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Available only when the aircraft is on ground
Displays only on Map
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EPU Estimated Position Uncertainty
HDOP Horizontal Dilution of Precision
HFOM Horizontal Figure of Merit
VFOM Vertical Figure of Merit
Information fields indicate the
accuracy of the position fix.
HFOM and VFOM values
represent 95% confidence levels
in horizontal and vertical
accuracy.
Lower values mean higher
accuracy. Higher values are the
least accurate.
EPU is the horizontal position error estimated by the
fault detection and exclusion (FDE) algorithm, in feet
or meters.
Depicts area surrounding the ownship when GPS
cannot accurately determine aircraft location
Expands as GPS horizontal accuracy degrades
Shrinks as accuracy improves
Translucent with minor shading so as not to
obstruct other features
Circle of
Uncertainty
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