Selective FEC communications (SFEC) are employed when:

Multiple stations without a group SELCAL must receive communications without using their transmitters (Radio Silence).

Multiple stations must receive communications by using their transmitters to achieve phasing.

An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in.

An individual station must receive communications without using any transmitters (Radio Silence).

Selective FEC communications (SFEC) are...