Sextant vs Messina Strait Currents

A complete celestial navigation toolkit for sailors, students, and the curious. When the GPS quits, the sun, moon, planets, and stars still work. Sextant takes you all the way from a single sextant reading to a line of position on a map — with every correction shown, so you can check the math by hand if you want to. Point the camera at the sky The Sky tab labels every navigational body in view — the sun, the moon, all four navigational planets, and 58 navigational stars — using the magnetic compass and on-device ephemeris. Spot a star, tap its name, and a sight starts with that body identified and the time stamped. Sight with your camera, or a real sextant The camera flow measures altitude along the camera's line of sight from the phone's gravity sensor and shows how upright you're holding it. Multi-shot mode takes a series and saves the trimmed mean. Or just type your altitude from a brass sextant and let the app do the reduction. Every body you'll ever shoot Sun, moon, all four navigational planets — Venus, Mars, Jupiter, Saturn — and all 58 standard navigational stars. Positions computed from astronomical theory (VSOP87 for the Sun and planets, ELP-2000 for the Moon, star positions with precession and proper motion), not stale tables, and tested against U.S. Naval Observatory data. Works fully offline. Noon Sight in one tap Take the sun's altitude at meridian passage; the app gives you latitude. It also predicts the exact UTC of local apparent noon so you know when to look. Plot your fix Every sight draws a line of position on a real map. Take more than one, apply dead reckoning between them, watch your running fix come together — exactly like the paper-chart workflow. Tools sailors actually use - Polaris one-shot latitude - Solar Compass — true bearing of the sun, for compass deviation checks - Starfinder — what's above the horizon right now - Reduction tables (dip, refraction, semi-diameter) - DMS / decimal converter Learn celestial navigation as you go Step through your first sight with a guided walk-through. Every screen has inline help, and every correction in the sight reduction — dip, refraction, semi-diameter, parallax — has an explanation a tap away. Check the app against your hand calculations, or let it do all the work. Share your work Export sight records as CSV or as a printable PDF work-form in the classic HO 229 layout. No subscription. No ads. No internet. One purchase, everything included.

Messina Strait Currents provides tidal current predictions for the Strait of Messina, helping anyone navigating the Strait to plan crossings safely. Based on official harmonic constants, the app calculates tidal current direction and speed at the Strait of Messina's two main reference points, Punta Pezzo and Ganzirri, as well as in secondary areas of the Strait. Results are also displayed through a simple graph, providing a quick and clear overview of tidal current trends. Tidal currents in the Strait of Messina may exceed 6 knots. Knowing the predicted current conditions helps you plan a safer crossing. Home Screen widgets provide at-a-glance current information for Punta Pezzo and Ganzirri, without opening the app. Apple Watch. Check tidal current direction and speed at Punta Pezzo and Ganzirri directly from your wrist, view current trend charts, and access current analysis for the Strait of Messina. Use the Digital Crown to explore predictions by adjusting the date and time. Ring Smart for Apple Watch. Ring Smart watch face complications display current values and trends for Punta Pezzo and Ganzirri at a glance, without opening the app. Shortcuts and Siri. Check tidal currents at Punta Pezzo, Ganzirri, and across the Strait of Messina using shortcuts, which can also be activated with Siri for quick access to current information. The app also provides: • Sunrise and sunset times • Moonrise and moonset times • Moon phase • Illuminated portion of the Moon Specifically designed for navigation in the Strait of Messina. Messina Strait Currents builds on the experience of the previous app, available on the App Store since 2012, with a completely redesigned layout and numerous improvements. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/