NAVTEX broadcasts notices to mariners on which frequency?

NAVTEX broadcasts notices to mariners on which frequency?

• A. 518 kHz
• B. 2170 kHz
• C. 156.650 MHz
• D. 2.182 kHz

Answer: (A)

NAVTEX uses a dedicated medium-frequency channel, 518 kHz, for automated broadcasts of navigational and meteorological notices. This frequency was chosen because MF waves propagate well over long distances at sea, allowing ships to receive important information reliably with relatively modest transmitter power. The other options are not used for NAVTEX: 2170 kHz lies in the shortwave region and is not the standard NAVTEX channel; 156.650 MHz sits in the VHF marine band and is used for voice weather transmissions rather than NAVTEX data; 2.182 kHz is far outside practical NAVTEX transmissions and would not support the data service.

NAVTEX uses a dedicated medium-frequency channel, 518 kHz, for automated broadcasts of navigational and meteorological notices. This frequency was chosen because MF waves propagate well over long distances at sea, allowing ships to receive important information reliably with relatively modest transmitter power. The other options are not used for NAVTEX: 2170 kHz lies in the shortwave region and is not the standard NAVTEX channel; 156.650 MHz sits in the VHF marine band and is used for voice weather transmissions rather than NAVTEX data; 2.182 kHz is far outside practical NAVTEX transmissions and would not support the data service.