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iMariner Celestial Navigation
iMariner Celestial Navigation Vs. GPS Anti Spoof Pro

iMariner Celestial Navigation vs GPS Anti Spoof Pro Usage & Stats

iMariner Celestial Navigation is a complete toolbox : sight, fix, meridian, starfinder, solar compass Also embedded : nautical almanac (sun, moon, planets, starts) and astronomical computation (no more need for HO-249/HO-229 tables) - displays almanac informations : Sun, Moon, Venus, Mars, Jupiter, Saturn and 92 brightest stars. At this step, you can use these almanac data with HO.249 tables, if you want to reduce manually. - reduces a sight : getting your observed altitude and the precise time, it calculate Intercept and Azimut. You don't need any calculation ! Simply report Intercept and Azimut to your navigational chart. - You can save your observations by passages and send them by email in CSV format - take a fix : with two sights, iMariner is able to calculate your position (latitude/longitude) - meridian passage : iMariner helps you to take observations mandatory to know your position (latitude/longitude) - sight preparation : iMariner proposes you the best objects, here position (azimut and elevation), and the approximate time of the day the observation can take (nautical_twilight or nautical dawn). iMariner is a standalone application. It doesn't require internet connection. It is light and calculations are optimized to save energy on your boat. Includes a solar compass (and moon compass too). REFERENCES : iMariner has been inspirated by astronomical works of the following people. Brightest Stars Catalog Extraction of 92 stars >= 2.5 Mag from the vizier catalog, completed with some stars and star names. V/53A Catalogue of the Brightest Stars (Ochsenbein+ 1988) This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France vizier.u-strasbg.fr ============================= Le catalogue des etoiles les plus brillantes Catalogue of the brightest stars Ochsenbein F., Halbwachs J.L. =1987BICDS..32...83O Ochsenbein F., Acker A., Legrand E., Poncelet J.M., Thuet-Fleck E. ============================= AlgorithmsFrom the reference book Astronomical Algorithms by Jean Meeus Planets : VSOP87D theoryTables extracted from ftp://ftp.imcce.fr/pub/ephem/planets/vsop87/ and adapted to Objective-C. Bretagnon P., Francou G., : 1988, Astron. Astrophys., 202, 309. Pierre Bretagnon, Gerard Francou Bureau des Longitudes 77, Avenue Denfert-Rochereau F75014, Paris, France Moon : ELP2000 theory The lunar ephemeris ELP2000 M. Chapront-Touze and J. Chapront Service de Mecanique Celeste du Bureau des Longitudes 77, Avenue Denfert-Rochereau F75014, Paris, France Sky Maps Free maps from the IAU site : http://www.iau.org/public/constellations/ DeltaT value maia.usno.navy.mil

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GPS Anti Spoof Pro

Instantly compare observed celestial navigation altitudes with high precision, live calculated altitudes. Shoot the Sun, tap pause in the app, and get instant feedback. Pro version of the app is for serious navigation use and includes data for the Sun, Moon, Venus, Mars, Jupiter. Saturn. the 57 standard navigational stars, plus Polaris. Pro version can function for weeks in the middle of the ocean without network access. This app calculates the exact altitude that should be observed in celestial navigation at sea or on land 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. If the GPS position is wrong, due to Spoofing at sea, observations will not match. With this app and occasional quick sextant sights, mariners can reliably detect GPS spoofing. No GPS Spoofing? The app also functions as a celestial navigation trainer: take a sight and immediately compare against the app's display. No paperwork and instant feedback will improve celestial sextant skills in hours instead of days or weeks. The app works off-network, even in the middle of the ocean. If a network connection is available, the app will download temperature and pressure information automatically. Or weather data can be entered manually, if desired. 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 altitudes are accurate to a tenth of a minute of arc.