Touraj Amir Khosravi - Consultant and lecturer , PMO and Karaj Islamic Azad University
Mehran Raeesi - specialist , PMO

Radios have been used for help request on distress situations from the end of 19th century by using Morse code, then transfer of voice to request help on distress situations for ships wasavailable by analog radios that is being used until today. With the invention of digital radios and the need for transmission of text messages between ship in distress and other ships or ship in distress and shore stations, DSC was invented and come into use. It is used for help request byships in distress so the eventual goal is reached when the receiving party, especially in coast stations, can provide some kind of help. Help provision requires: trained people and adequate equipment. With respect to the radio coverage of DSC system and number of coast stationsequipped with this kind of radio, provision of these requirements is not available at all stations. Establishment of SAR centers requires that the centers can have direct, fast and accurate access to distress calls. The only way is to coincide the SAR centers with the DSC network centers.PMO has wisely considered this and has already started to network DSC radios. To convey the messages to network centers, while covering all coastal waters and beyond that by radios, and the next step is to complete the maritime SAR procedure by making that centers for SAR operations as well

DSC, Digital Radio, Ionosphere, Network, SAR