SUPPLYING THE NEEDS OF TRANSPORTING VESSELS ON TERRITORIAL WATERS AND UNDER THE RULE OF ISLAMIC REPUBLIC OF IRAN TO COMMUNICATE WITH PORTS AND COASTAL RADIO STATIONS, IS ONE OF THE DUTIES OF PORTS AND MARITIME ORGANIZATION. REGARDING THE LIMITATIONS OF MARINE FREQUENCY SPECTRUM AND MULTIPLICITY OF APPLIED SERVICES IN THIS BAND, THE OPTIMIZED AND MAXIMUM EXPLOITATION OF THE SPECTRUM IS OF SPECIAL IMPORTANCE. COASTAL RADIO STATIONS AND TRAFFIC CONTROL CENTERS BELONGING TO THE PORTS AND MARITIME ORGANIZATION HAVE BEEN KNOWN AS THE MAJOR BENEFICIARY OF THE MARINE FREQUENCY SPECTRUM AND ARE EQUIPPED WITH HIGH COSTS TO PROVIDE NEEDED SERVICES. THE OPTIMUM EXPLOITATION OF AVAILABLE EQUIPMENT AND PROVIDING APPROPRIATE RADIO SERVICES HAS ALWAYS BEEN A CONCERN FOR RELATED AUTHORITIES. CONSIDERING THE GENERALITY OF INFORMATION EXCHANGE BETWEEN VESSELS AND OFFSHORE AND THE NECESSITY OF AN OPTIMUM COMMUNICATION SYSTEM FOR VESSELS, THE USERS HAVE BEEN FORCED TO USE SATELLITE FOR USING INTERNET WHICH INVOLVE HIGH COSTS. THERE IS A POSSIBILITY TO USE ESPECIAL SOFTWARE BASED ON INTERNET PROTOCOLS (IP) TO SEND DATA THROUGH HF BAND AND BY CONNECTING TO THE INTERNET IN THIS BAND. IN THIS CONNECTION METHOD, IT WOULD BE POSSIBLE TO CREATE MOBILE TO MOBILE, GROUND TO MOBILE AND OTHER VARIOUS NETWORKS. ALSO, THE HF BAND WORKS AS A GATEWAY TO CONNECT TO AN EXTERNAL NETWORK (INTERNET), WHICH PROVIDES THE ABILITY TO TRANSFER DATA AND INFORMATION OR CONNECT TO THE INTERNET NETWORKS. THIS SYSTEM, BY CONNECTION AND INTEGRATION, PROVIDES AN APPROPRIATE AND STRONG GROUND FOR DATA EXCHANGE AND IS COST EFFECTIVE.