Part 1 The Global Maritime Distress and Safety System; Chapter 1 The GMDSS radionet; Chapter 2 Equipment maintenance requirements; Chapter 3 GMDSS personnel qualifications; Part 2 GMDSS Satellite Communications; Chapter 4 Satellite orbital parameters and outline satellite communication principles; Chapter 5 The Inmarsat organization; Chapter 6 The Inmarsat-A system; Chapter 7 The Inmarsat-B system; Chapter 8 The Inmarsat-C system; Chapter 9 The Inmarsat-M system; Chapter 10 Satellite mobile frequency bands; Chapter 11 The future; Part 3 Terrestrial Communications; Chapter 12 Signal propagation and the radio spectrum; Chapter 13 Antenna systems; Chapter 14 Radiocommunications systems; Chapter 15 The future;