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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 Navigation No Comments

The Classical Period and the Athenian Hegemony

The Athenian Trireme (Triere) and the Athenian hegemony When we think of polyremes, warships with more than a bank of oars, the triere, the most famous of these vessels, comes to our mind. The superiority of this Athenian ship — that was developed in Corinth, with three banks of oars — is confirmed in more […]

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, Maritime Safety 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 […]

By hartis Navigation No Comments

The Giants of the seas of the Hellenistic Time

The Hellenistic Age spreads from the death of Alexander the Great in 323 B.C. to 30 B.C. the year of the death of the last of the Ptolemies, Cleopatra VII, (some historians however consider that the Hellenistic World in the East continues up to the third, even the fourth century A.D. until to the end […]

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 […]

G.M.D.S.S

The Classical Period and the Athenian Hegemony

Coastal Navigation

GMDSS Sea Areas

The Giants of the seas of the Hellenistic Time

Nautical Instruments

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