Disagree with JVISS
He states... "In your area (and mine) 16 is monitored always, but only used for emergencies". Channel 16 is also a hailing channel. You call (hail) another boat on channel 16, when he replies, you arrange passing signal if required or any safety items, then you shift to another channel for general chit-chat conversation.Depending on where you live, channel 13 is also used for inland channel and bayou traffic. Also in some areas bridges will only answer on channel 13 for openings.Bridge to Bridge traffic is handled on, i think, channel 69 on the Mississippi River. Some locations Channel 10 or 11 is used for locks. You must read the U.S.Coast Pilot for radio frequency channels in specific areas.