Marine Sextant is an reflective type optic angle-measuring device.
1.It measure the altitudes of celestial bodies above the visible sea.
2.Measure the two horizontal included angles between the three known postion objects on the ground, utilize three arm protractor to check the vessel position on the chart.
3.Measure the vertical included angle of known height object to get the distance.
It is simple, light, and handheld. But it is necessary to see the celestial and water antennas at the same time when use, restricted by night or visibility.
Marine Sextant is also called Nautical Sextant.