iSextant is a sun sign reduction program, that can be used to confirm your location in the event of GPS signal problems. It is important to note that in increasing world orbital use/misuse we are always closer to the http://en.wikipedia.org/wiki/Kessler_syndrome where there is an increasing chance of GPS outage.iSextant can also be used as an aid to learning astro-navigation. For more information about astro-navigation please refer to http://en.wikipedia.org/wiki/Astro_navigation.

iSextant alternatives

SeaHelp

SeaHelp the breakdown service at seaWith this kind of service, SeaHelp App is offering to all skippers the possibilty of asking for professional help on short notice in breakdown or emergency situationsin the areas of Croatia, Slovenia, Northern Italy and the Balearic Islands. After activating the application, the help button has just to be pressed once in order to generate a SMS which will be received by the SeaHelp operations centre, tranferring the coordinates of the actual position, the mobile phone number and, in the case of a SeaHelp membership, as well the membership number. This information is supplied without liability.

  • rating 5.0
  • size 17.8 MB

ezSights Celestial Navigation

Please check out www.ezCelestial.com for a full description of the application and in-app help pages.ezSights is a complete celestial navigation package for the iPhone, iPod touch and iPad. It provides simple interfaces for entering sight parameters, planning the navigational bodies to use and time of day to make the observations, and entering the observations made using a sextant. Integration with iOS data network for setting UTC time from network time using NTP servers.

  • size 26.0 MB

iNA Digitial Nautical Almanac

iNA computes all ephemeris data available in the daily pages of the USNO Nautical Almanac. This information is required when doing astronomical computations for celestial navigation, local noon, sunrise, and others. We recommend using StarPilot which has a built-in Nautical Almanac and will perform all the complex calculations for you.

  • size 1.4 MB

Sight Calc

Sight Calc is a specialized calculator for the that eases the task of calculating sight reductions via the Law of Cosines method. It does not use Nautical Almanac data, so you must first compute LHA (Local Hour Angle) and declination, and determine your approximate latitude. Please report any bugs or suggestions to:[email protected]

  • size 1.5 MB

Celestial by Navimatics

Celestial is a complete package for celestial navigation on your iPad, iPhone or iPod Touch. It can perform celestial sight reductions, calculate fixes, present them visually, manage sights on multiple trips and assist in sight planning. Visit http://navimatics.com or search for navimatics in the AppStore for additional navigation products.

  • size 14.9 MB