Sextant required! Instant celestial
navigation... The most reliable way to detect GPS Spoofing and
other anomalies of electronic navigation is by comparing against
the measured altitudes of celestial bodies including the Sun Moon
bright planets and stars. This app calculates the exact altitude
that should be observed with a sextant assuming that the GPS
position is correct. No paperwork is required no tables of
corrections. All corrections are included automatically: index
error system time error dip of the horizon refraction temperature
and pressure corrections to refraction altitude above sea level
parallax and also gravitational deflection of the vertical (a
correction of up 2 nautical miles not handled by any other
celestial navigation sight-clearing product) are all included
automatically. It's also a great sextant trainer: take a sight and
immediately compare against the app's display. The app works
off-network. If a network connection is available it can download
temperature and pressure information automatically. The ephemeris
data is generated from the same JPL numerical integrations of lunar
and planetary motions used by the official Nautical Almanac and
Astronomical Almanac. All coordinates are accurate to one second of
arc and displayed sextant altitudes are accurate to better than a
tenth of a minute of arc (the limiting precision of the best marine
sextants).
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GPS Anti Spoof
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