WAAS GPS
Sentry, Sentry Mini, and Sentry Plus are equipped with an integrated WAAS GPS. Sentry can
receive GNSS position data from up to three GNSS constellations concurrently (GPS, Galileo,
and GLONASS). Sentry GPS is capable of signal spoofing detection and advanced jamming
techniques.
Sentry GPS Accuracy
GPS accuracy is determined by Sentry’s internal processor. The processor controls Sentry’s
GPS LED and sends accuracy data to ForeFlight for display in the Accuracy instrument.
GPS LED
On the front of each Sentry is an LED that automatically changes color
as Sentry's GPS accuracy changes.
•
Green - Sentry providing three-dimensional GPS data.
•
Yellow - Sentry providing two-dimensional GPS data.
•
RED - Sentry not providing GPS data.
ForeFlight Mobile Accuracy Instrument
When an accurate GPS signal is provided by Sentry, aircraft position is displayed on the
ForeFlight moving map. The ForeFlight Accuracy instrument displays Sentry’s reported GPS
accuracy. Smaller reported values provide more accurate GPS position information. The
Sentry Plus OLED display can also display GPS accuracy.
To display GPS accuracy in ForeFlight, enable the instrument panel by tapping the airspeed
indicator button in the upper toolbar. Tap the instrument panel where you want Accuracy to be
displayed. Select GPS Accuracy from the list of available instruments.
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