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By hartis Hydrography, Navigation No Comments

Distance

Nautical Mile: For the measurement of distances navigation uses nautical mile. Nautical Mile equals to 1852 meters and is sub- divided into cables of one tenth of the nautical mile. The maximum value of a mile at the poles is 1864 meters and the minimum value at the equator is 1842,8 meters. Distance In navigation […]

By hartis Navigation, Hydrography No Comments

Navigation

The term navigation expresses the procedures that are being applied for the safe command of the ship from one harbor to another or from one point of the globe to another in the least amount of time possible. Navigation, depending on the area a ship sails, the means and the instruments it uses, as well […]

By hartis Navigation, Nautical Information No Comments

Coastal Navigation

Coastal navigation is a navigational method concerning the vessel’s movement in relation to the approximate shore, the visible objects in the sea (islets, rocks, buoys, light vessels) and the sea depths. Coastal navigation demands great experience. The mariner has to be in continuous vigilance, given that in open sea a possible fault can be corrected […]

By hartis Navigation No Comments

Nautical Instruments

Except from the nautical chart, in order to ensure the required safety, the mariner is obliged to use a variety of nautical instruments. The appropriate use of the nautical chart requires certain “surveying instruments” that are mandatory in vessels. (1) Parallel for shaping courses and bearings (2) Pair of compasses for measuring distances (3) Protractor […]

By hartis Navigation, Maritime Safety No Comments

G.M.D.S.S

Global Maritime Distress and Safety System Radio has been the foundation of distress and safety systems used by ships for the safety of human life at sea in 1899. It was soon realized that to be effective a radio based distress and safety system had to be founded on internationally agreed rules concerning the type […]

By hartis Maritime Safety, Navigation No Comments

GMDSS Sea Areas

GMDSS Sea Areas For the needs of the G.M.D.S.S applications, sea areas have been world widely characterized as: Sea Area A1. Within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available. Such an area could extend typically 20- 50 nautical miles from the coast station. Sea Area […]

Distance

Navigation

Coastal Navigation

Nautical Instruments

G.M.D.S.S

GMDSS Sea Areas

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