android

Nautical Almanac

• Equatorial geocentric coordinates: RA/GHA, Declination for Sun, Moon, and navigational stars and planets. 

• SD, HP

• SHA

• Visible sky: identification of stars and planets - it plots the visible sky from a position. Polar & horizon chart

• Planning observation: phenomena - Twilight, - Rise/set for Sun and Moon, - Meridian passage

• Solar time: GAT, LAT, LMT, Equation of time

• Sidereal time (Aries): GHA, GAST, LAST, LHA

• Lunar distances

• Under development: SSD, ...

Sextant

• Real time calculation of the instrumental altitude Hs for comparison of your shots.

• For training or improving your skills with a marine sextant, an aircraft octant, an artificial horizon, or a theodolite.

• Useful for index error determination.

• For Sun, Moon, and navigational stars and planets.

• Location on map of your position by GPS or manually.

Nautical Astronomy

• Latitude by Polaris

• Noon sight

• Sun ex-merian sight

• Time sight for the Sun

• Latitude by the Sun´s Altitude and Time

Sight reduction

• Calculated altitude Hc and azimuth Zn

• Input for observed altitude Ho or instrumental Hs (Nautical Almanac data needed for the Sun and the Moon)

• Calculator: Line of Position, intercept method (p=Ho-Hc, Zn)

• Running fix

• Plots up to 3 Marcq Saint Hilaire Lines of Position on Google maps

• Local hour angle (LHA)

• Old versions available at sourceforge

Fix by 2 CoPs - vector solution

• For two sights, it calculates the two solutions, and plots the circles of position, or circles of equal altitude on a google map.

• Running fix

• Method explained in the papers:

  • Vector Solution for the intersection of two Circles of Equal Altitude.

  • Use of rotation matrices to plot a circle of equal altitude.

Variation

• Variation for the current day. (Local magnetic variation or magnetic declination)

• WMM2020 - World Magnetic Model 2020, valid from 10/12/ 2019 through 31/12/2024.

Sailings

• Route between a departure and a destination point, on Google map.

• Rhumb line (loxodromic)

• Great Circle (orthodromic). Waypoints of the great circle route. 

Coastal Navigation

• Lines of Position: Bearing, range & horizontal angle

• Plot on google maps.

• Brief guide: Español English

Help & examples

Available on the app store: google play

Astronavigation (coming soon!!! in progress...)

• Observed altitude Ho

• Sight reduction. MSH LoP for multiple sights.

• Motion of the observer

• Fix and ellipse of confidence

Data safety

No data shared with third parties

The developer says these apps do not share user data with other companies or organizations. 

Data collected

Location

Approximate location and Precise location are collected for App functionality.