Proposal of a medium frequency offshore grid for identification of vessels sailing in high density maritime Spanish routes

For many reasons, 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 Automatic Identification System (AIS). But it is not a system that excludes the latter either, since in some exceptional circumstances it is based on it In this paper we will study the operability of the proposed system for Spanish maritime routes with more relevance in terms of traffic density.