GPS Anti Spoof Pro vs Roam Explorer

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.

Discover, track, and share your off-road adventures with Roam – the ultimate companion for 4x4, dirt bike, ATV, and snowmobile enthusiasts. Whether you're tackling rugged mountain trails or exploring remote backcountry, Roam helps you record your journey, connect with fellow adventurers, and discover new paths less traveled. Track your off-road expeditions with precise GPS mapping, view detailed metrics about your rides, and build a community around your passion for outdoor exploration. With unlimited storage for your tracks and the ability to download regions for offline use, Roam keeps you connected even when you're miles from civilization. Key Features: * Record detailed tracks of your off-road adventures with GPS precision * View comprehensive ride metrics including elevation, speed, distance, and duration * Upload photos, videos, and notes to document your experiences * Download unlimited regions for offline navigation * Discover new trails and popular routes through our interactive heatmap * Connect with a community of like-minded off-road enthusiasts * Follow friends and favorite riders to see their latest adventures * Contribute to map improvements with your own edits and trail notes * Unlimited storage for all your tracked rides – never lose an adventure * 100% FREE to use – no subscription required Roam is built by off-road enthusiasts for off-road enthusiasts. Join our growing community today and transform the way you explore the great outdoors!