GMDSS GMDSS Frequencies and Radio Bands 2

Question 1

What is the HF DSC distress frequency in the 8 MHz band?

Accepted Answer

8414.5 kHz

Answer

8414.5 kHz is the designated HF DSC distress frequency in the 8 MHz band used for long-range GMDSS alerting.

Question 2

Navtex broadcasts on 490 kHz are primarily used for what purpose?

Accepted Answer

Local language maritime safety broadcasts

Answer

490 kHz Navtex broadcasts are used for local or national language maritime safety information, complementing the international 518 kHz service.

Question 3

What is the frequency of the satellite EPIRB signal transmitted on the Cospas-Sarsat system?

Accepted Answer

406 MHz

Answer

406 MHz is the primary frequency used by Cospas-Sarsat EPIRBs for satellite detection and accurate position reporting.

Question 4

Which frequency do Search and Rescue Transponders (SARTs) operate on?

Accepted Answer

9 GHz (X-band radar)

Answer

SARTs operate on 9 GHz (X-band) radar frequency, responding to radar pulses from ships and aircraft to show a series of blips on radar displays.

Question 5

What is the homing frequency transmitted by an EPIRB to assist SAR aircraft and vessels?

Accepted Answer

121.5 MHz

Answer

EPIRBs transmit a homing signal on 121.5 MHz in addition to the 406 MHz satellite signal to help SAR units home in on the beacon.

GMDSS - Global Maritime Distress and Safety System Practice Test