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The Global Maritime Distress and Safety System (GMDSS) is a safety procedure, types of equipment, and communication protocols that have been internationally agreed upon to ensure the safety of vessels and facilitate search and rescue operations for ships, boats, or aircraft in distress.
GMDSS consists of several new or existing systems that have been operational for several years. This system aims to: provide alerts (including the location of units in distress), coordinate search and rescue, detection, disseminate maritime safety information, general communication, and ship-to-ship/emergency call center communication. The system must also have a secondary backup for emergency signaling and emergency power supply.
NAVTEX (NAVigational TEleX), also known as Navtex or NavTex, is an international low-frequency automated printing service for the purpose of disseminating navigational information, warnings and meteorological forecasts, as well as maritime safety information (MSI) to ships. Navtex is provided to offer an inexpensive, easy service and automatic reception of information on ships within a 370 km (200 nautical miles) range from land.
Digital selective calling or DSC is a standard for sending digital messages using medium frequency (MF), high frequency (HF), and very high frequency (VHF) maritime radio systems. It is one of the key components of the Global Maritime Distress and Safety System (GMDSS).
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