Ian Waugh - A Mariner\'s Guide to Marine Communications

Inmarsat

Satellite

Cospas-Sa rsat

Satellite

I Ship" GMDSS equipment I

Cospas· ~==::::::; ...

Sarsat i HF SSB A4 Area I

........ ~.f..~.~ ...... i Radio I-- - - - f--

Inmarsat i with

SafetyNET; AlB/C; l:: DSC A3 Area I

Inma.rsat and ) MF SSB I-----f--

EPIRB ...... Radio A2 AreaJ

... with

..-" .. ..-" .. ..DSC ......... .... I-----f-.

..-" VHF

. ..-" Radio

..... NAVTEX with DSC A 1 Area I

T

Land-based

infrastructure

Imnarsat

Land Earth StatIon

Cospas-Sarsat

Ground StatIon

NAVI'EX

StatIon VHF/MF/HFDSC Coast Radio Station

(LES)

T

f~~--l--------l--HM~et~o;jjffi~cejf-~ +

I (Weather) :

'-----il--+----ill~~~;)~ - - ~ - - - - - I

Irelecomm's .. + Telecomm's

networks It---- Maritime Rescue Coordination Centre..... networks

(MRCC)

Hospitals/Medical Services (for Medical Advice);

and routine calls and messages between ships and the officelhome

Figure 1.4
The main GMDSS infrastructure.
Not shown on the diagram are the handheld VHF radios and the Search and Rescue
(radar) Transponder (SART). Compare this figure with the diagram 'Basic Concept of
the GMDSS' in ALRS Vol. 5.

MARINE COMMUNICATIONS 11