GMDSS: Element 7R

1. A MF-HF SITOR (NBDP) transmitters using telex follow on frequencies.
2. B Inmarsat Signals routed via the RCC to the SAR vessels & aircraft under their control.
3. C VHF transmitters to reach SAR aircraft and OSC vessels as well as the RCC/coast station.
4. D MF-HF SSB transmitters using voice follow-on frequencies.

Tip: press A-D to answer