Ship navigation system that is already set in the Global Maritime Distress adan Safety System (GMDSS). The GMDSS is an international agreement in which regulates communication procedures, the procedure’s safety, as well as the types of existing equipment on board vessels. The intent of the agreement is to improve safety and also to make procedures easy to implement in order to avoid danger. Existing communication systems in the GMDSS indeed have been specially designed to ensure the purpose of handling safety and distress signaling in the sea and this applies to the whole world. Of course, this system has other capabilities that send and receive signals transmitted by the danger that another ship, the ship affected so they can immediately get help as soon as possible. The system can also be used to study the safe route that will pass quickly and safely.
Some systems are incorporated in the GMDSS has long operated with functions as diverse as general radio communication which aims to ship communication tool through the existing radio networks on land and with regard to safety. Ship navigation systems such as alerting useful to give notice of the existence of a disaster or danger, and to coordinate an inter-ship aid.
Tool – navigation tools that are typically used in marine vessels such as radar (radio detection and ranging), GPS (global positioning system), RDF (radio direction finder), enchosounder, AIS (automatic identification system), and many others. The navigation tool must meet the standards set by the GMDSS as to ensure the safety of the crew is in the ships.
GMDSS communication system is divided into two satellite communication systems and terrestrial communications systems created with the aim to coordinate the danger signals between ships on the high seas. Communication can be done within a range of short, medium, or remotely by using a specific frequency that VHF (very high), and MF (medium), and HF (high) frequency. The main functions of the navigation system in the ocean is to determine the bow so that it can be seen within a ship from origin to destination. An explanation of the navigation systems of ships can briefly describe the complexity of existing systems on ships.
For that, a man who drove the ships and crews should be aware of GMDSS and navigation systems used by ships dikemudikannya in order to prevent all the bad things that are not desirable. For that, it needs a deeper recognition of navigation tools such ships to know the basic things about the navigation tools that are used all ships.