GPS Anti Spoof vs Cloud Finder

Instantly compare observed celestial navigation altitudes with high precision, live calculated altitudes. Shoot the Sun, tap pause in the app, and get instant feedback. Standard version includes data for the Sun, Venus, and two stars. The Pro version of the app is for serious navigation use and includes data for the Sun, Moon, Venus, Mars, Jupiter, Saturn, the 57 standard navigational stars, plus Polaris. Both versions function off-network and at sea however the standard version only works for ten days off-network. The Pro version can function for weeks in the middle of the ocean without network access. This app calculates the exact sextant altitude that should be observed in celestial navigation at sea or on land assuming that the GPS position is correct. No paperwork is required, no tables of corrections. All corrections are included automatically: index error, system time error, dip of the horizon, refraction, temperature and pressure corrections to refraction, altitude above sea level, parallax, and also gravitational deflection of the vertical (a correction of up 2 nautical miles not handled by any other celestial navigation sight-clearing product) are all included automatically. If the GPS position is wrong, due to Spoofing at sea, observations will not match. With this app and occasional quick sextant sights, mariners can reliably detect GPS spoofing. No GPS Spoofing? The app also functions as a celestial navigation trainer: take a sextant sight and immediately compare against the app's display. No paperwork and instant feedback will improve celestial sextant skills in hours instead of days or weeks.  The app works off-network, even in the middle of the ocean. If a network connection is available, the app will download temperature and pressure information automatically. Or weather data can be entered manually, if desired. The ephemeris data is generated from the same JPL numerical integrations of lunar and planetary motions used by the official Nautical Almanac and Astronomical Almanac. All coordinates are accurate to one second of arc, and displayed altitudes are accurate to a tenth of a minute of arc.

Cloud Finder turns the sky into a field guide. Point your camera at the clouds and get a best-guess identification that runs entirely on your device — no internet, no account, no photos uploaded. Spot clouds even with zero signal. IDENTIFY THE SKY, ON YOUR DEVICE - Snap a photo and match it against the ten classic cloud genera — cirrus, cumulus, stratus, cumulonimbus and the rest — plus aircraft contrails - On-device AI model, works fully offline - Each cloud comes with what it tends to mean for the weather READ THE WEATHER FROM THE CLOUDS - Learn what every cloud usually signals — the near-term outlook it tends to bring, and how it evolves - Will it rain, when, and how much, plus what each cloud means for flying and sky-watching CLOUD LIBRARY - Browse all the cloud types, grouped by how high they sit - Reading their height and shape together is the key to forecasting from the sky YOUR SKY JOURNAL - Save every cloud you identify — with the photo, date, and place — and build your own field log FREE & PRO Cloud identification and the Cloud Library are free forever. Cloud Finder Pro is a one-time unlock that adds the full Sky Forecast, fun facts, and your saved Sky Journal. No subscription. A NOTE ON WEATHER Cloud Finder is a fun, educational sky-watching companion — not an official forecast. AI can be wrong, and cloud types blend into one another. For anything that matters — travel, aviation, severe weather — always rely on your national weather service.