1. GMDSS havområder

2. GMDSS COSPAS (russiske) SARSAT (US/CA/FR) I alt 5 satelliter.
NORD-SYD over polerne.
Ca km over jorden.
406 MHz, position ved doppler.
INMARSAT, 4 SATELITTER
Geostationære ved ækvator.
Ca km.
1,5/1,6 GHz.

3. EPIRB - Emergency Position-Indicating Radio Beacon
EPIRB is used to alert search and rescue services in the event of an emergency. It does this by transmitting a coded message on the 406MHz distress frequency, which is relayed via satellite and earth stations to the nearest rescue coordination centre. Marine EPIRBs work with the COSPAS-SARSAT polar orbiting satellite network which provides true global coverage, and can determine the casualty's position by triangulation to within 3 Nm (doppler) - or just a few metres if fitted with a built-in GPS (Global Positioning System). Most units also have a secondary distress transmitter, which operates on the old 121.5MHz and is used for homing purposes.

4. RHOTHETA DIRECTION FINDER (NØDSIGNALER)

5. SART – Search And Rescue Transponder
Sender på 9 GHz (3 cm) navigationsradar frekvens

6. EPIRB - Emergency Position-Indicating Radio Beacon
SART – Search And Rescue Transponder

7. AIS SART
Sender sin position (GPS), som registres på AIS modtagere
og ECDIS (kortplotter) på  MHz og  MHz (VHF)
Kan erstatte SART’en