Celestial Nav
Skytip LLC
About this app
- Age 10
- Updated Sep 12, 2025
- OS IOS
Editor reviews
Celestial Nav is a practical celestial navigation and reference app for sailors, offshore cruisers, and learners. It helps you plan observations, reduce sextant sights, and plot fixes without relying on the internet. Fast, accurate, and easy to use, it brings a modern workflow to a classic seamanship skill.
Core features:
- Almanac and ephemeris: Sun, Moon, planets, and navigational stars with rise/set, twilight, and key data for planning.
- Sight reduction: Enter sextant altitude and time to get intercept and azimuth with step-by-step guidance.
- Plot and save: Combine multiple sights, visualize lines of position, compute a fix, and export results for your log.
Why it stands out: offline-ready, clear sailor-friendly interface, built-in tips, and a streamlined workflow. Ideal for celestial navigation training, passage planning, and emergency backup. Keywords: celestial navigation app, nautical almanac, sight reduction calculator, sailing navigation, offline navigation reference.
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How to use:
1. Download and open the app, then allow location access or enter your dead-reckoning position, date and time, and preferred units.
2. Create a profile or continue as a guest, and download any offline data packs you want for at-sea use.
3. Choose a celestial body to view almanac data and recommended observation windows for accurate sights.
4. Take a sextant sight and enter observed altitude, exact time, index error, and height of eye; review the computed intercept and azimuth.
5. Add a second sight from a different body or time, then plot lines of position to get a fix; save, export, or share the record.
6. Explore advanced tools such as star finder, twilight planner, DR track aids, and custom time sources for more precise workflows.