Automatic identification system of vessels using the grid method

For many reasons, going from the environmental to the maritime safety, it is required a marine traffic control able to track in real time vessels approaching or moving away from the coasts. The innovation of this Automatic Identification System of vessels - with regard to some others already existing – is that this one is not a satellite system and it is not limited to a certain coverage distance, as happens with the AIS. But it is not a system that excludes the latter either, since in some exceptional circumstances it is based on it. This paper deals with the System technical approach for future implementation in certain sea routes with given traffic density