Sextant Calculator

About Sextant Calculator

Sextant Calculator makes celestial navigation arithmetic simple. Add, subtract and average angles and times with ease. Essential for sailors and navigation enthusiasts.

Sextant Calculator is the essential tool for celestial navigators, designed to simplify the arithmetic of sight reductions.

FEATURES

- Angle Calculations
Enter angles in degrees and decimal minutes (DD MM.m) format. Add, subtract, or divide angles with a single tap. Perfect for working through sun, star, and planet sights.

- Time Calculations
Work with hours, minutes, and seconds. Add and subtract times for GMT calculations, zone time conversions, and chronometer checks. Results automatically handle overflow into days when needed.

- Averaging Made Simple
Use the divide function to quickly calculate the average of multiple sights. Enter your total, divide by the number of observations, and get your mean position.

- Purpose-Built Keypad
A custom colour-coded keypad designed specifically for navigation calculations. No fumbling with a standard calculator - every button has a purpose.

- Day and Night Modes
Switch to red night mode to preserve your dark adaptation during night watches. Essential for practical celestial navigation at sea.

- Results Tape
See your complete calculation history in the scrollable results display. Review your work and catch errors before they affect your position.

DESIGNED FOR NAVIGATORS

Whether you are a yacht skipper crossing an ocean, a merchant marine officer maintaining traditional skills, or a student learning celestial navigation, Sextant Calculator removes the tedium from sight reduction arithmetic.

No more mental arithmetic errors. No more reaching for pencil and paper. Just clean, accurate calculations every time.

Works offline - no internet connection required. Your navigation calculations work wherever you are, from mid-ocean to the most remote anchorage.