SAILORS TWILIGHT

Visibility is the maximum distance which can be seen on the horizon with naked eyes and without using any equipment. Good visibility is important for safe navigation and accident reduction. The officer on lookout will estimate the visibility all aro…

A great circle is a circle on the surface of the sphere, whose radius is the same as the radius of the sphere. Equator is a great circle. A great circle drawn between two points on earth is the shortest distance between points. Sailing through a gre…

Mercator charts: Mercator charts are charts used in navigation onboard ships. This chart is used for Rhumb line sailing onboard ships. Rhumb lines are straight lines which cut every line at the same angle. Mercator projection is also called as cylin…

Nautical Pubilications are a set of publications , which are published by either national governments or by professional organisations , which serve the use of making the navigation of the ships ,boats and other vessels easier. The important Nautica…

Navigation of ship through heavy weather demands great attention and care from the ship's crew. During the 4 hours of watch of the officer on watch he is the full incharge of ship and  the representative of the Master. The Officer on watch (OOW)…

Tropical Revolving Storms are areas of tropical parts which have a severe low pressure systems. In atmosphere they are viewed as a whirl or vortex. TRS( Tropical Revolving Storms) have different names in different parts of the world. It is called as…

Beaufort Scale is a scale used at sea to estimate the wind speed based on observations of the sea surface and the force of wind. This scale was introduced by Irish hydrographer Francis Beaufort of the royal navy in 1805. As this scale is based on th…

Sextant is a precession instrument which is used to measure the altitudes of celestial bodies. I have explained earlier about Marine sextant.                                                                               Click for more about Marine S…