I have an Icom VHF marine radio, and I'm attempting to contact another VHF operator. But, even though we are very close, we can't seem to be able to communicate. Stranger still, some channels seem to be working, and others do not!

Most marine channels can be used for direct ship-to-ship communication. They are called simplex channels. Some marine channels are duplex, and can only be used for ship-to-shore communications. Duplex means that the receive and transmit frequencies are different for one given channel.

02/06/2011