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EZ Sextant Gameplay, Trailers and Related Videos

Watch Sextant Tutorial: The Principle of the Sextant video.

Watch EZ Sextant introduction and tutorial - Open-water navigation using your smartphone video.

Watch How to use a sextant video.

Watch Sextant Tutorial: Taking Sights With A Sextant video.

Watch Sextant Tutorial: Errors and Corrections video.

Watch Whole Horizon vs. Split Horizon Sextant Mirrors video.

Watch Getting Started in Celestial Navigation (The Marine Sextant) video.

Watch Should You Get a Plastic or Metal Sextant? video.

Watch Can You Really FIND Your COORDINATES With a SEXTANT? | Sailing Wisdom video.

Watch Celestial Navigation Made Easy - Part 1 of 2 video.

About the application:

The phone's camera is used to create sightings of the sun, moon, Venus, or Mars. The sighting results are plotted as running fixes on a latitude/longitude grid for simple navigation. Sighting accuracy depends on, but not limited to: camera field of view, camera resolution, lens distortion, calibration, and player skill. A camera with a field of view equal to ninety degrees is optimal. If your smartphone has multiple cameras, the one with field of view closest to ninety degrees is selected. A sighting is created by taking a picture of the celestial object and horizon and entering the height above the water. Celestial objects supported are the sun, moon, Venus, and Mars. The photo is stamped using the phone's clock but can be overridden if in error. Then you tap on the sun and center the cursors using arrows. Next, tap on the horizon and center the horizon line. The sighting results are plotted as a line of position. Two or more sightings are combined into running fixes, i.e., the best estimate of your position. As with a sextant, objects could have altitudes greater than 20 degrees to reduce refraction errors. A one-time calibration is needed to achieve the best achievable sighting accuracy. This entails taking five to ten photos and entering an accurate latitude and longitude when taking the picture. Accurate sources of latitude and longitude are the chartplotter or VHF radio. Smartphone GPS's are not accurate enough when out at sea. Photos taken on the beach can also be used for calibration using Google Earth for latitude and longitude.