GMDSS Maintainer: Element 9

1. A Multiple stations without a group SELCALL must receive communications without using their transmitters.
2. B Multiple stations must receive communications by using their transmitters to achieve phasing.
3. C An individual station must receive communications without transmitting (Radio Silence).
4. D An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.

Tip: press A-D to answer