1. Eirik Bliksrud Norwegian Post and Telecommunications Authority
ITU-R Sg.8 Seminar The Global Maritime Distress and Safety System (GMDSS)
Eirik Bliksrud
Norwegian Post and Telecommunications Authority

2. The (Future) Global Maritime Distress and Safety System
Planned in the -70s/-80s to replace morse:
Automatic, not manual
New technology: digital modulation
satellite systems

3. Fulfil 9 functional requirements wherever it is
Alert shore and ships
Communicate
Be located
Receive safety information

4. Sea areas A1: VHF - Line of sight A2: MF - Ground wave
A3: Inmarsat – GSO
A4: HF - Reflections

6. Radiosystems in the GMDSS
VHF, MF and HF: DSC, voice, data
Inmarsat: Voice, data, nav.info
NAVTEX: Nav. Information
COSPAS-SARSAT: EPIRBs

7. Digital Selective Calling (DSC)
Call individual or groups of stations
Distress, safety, routine calls
Contains identity, position and other info
100/1200 b/s Time diversity

9. WRC-07 Agenda 1.14: Review of the GMDSS Listening watch on ch. 16
Digitalisation of VHF (Appendix 18)
Digitalisation of HF
New data systems: HF internet

10. New systems in GMDSS? New satellite systems ? IMT-2000 ? Coverage
Priority
Pouting to RCC
Globally implemented
On-scene communications

11. GMDSS Not so fancy Not so modern Serves well, saves lives
Simple, robust systems/equipment
True global compatibility
Still not fully implemented
Changes are slow to implement