Explanation: Routine ship-to-ship voice traffic is primarily conducted on designated intership channels to avoid congesting critical frequencies. **Ch-08** is a simplex channel specifically allocated for intership (ship-to-ship) general purpose voice communication. This makes it the most likely choice for routine conversations between vessels. **Ch-16** is the international distress, safety, and calling channel. While vessels initially make contact on Ch-16, they are required to switch to a working channel like Ch-08 for routine conversations to keep Ch-16 clear for emergencies. Therefore, it's not used for the *routine traffic* itself. **Ch-70** is dedicated exclusively to Digital Selective Calling (DSC) and is not used for voice communication. DSC is an automated system for sending distress alerts and establishing contact digitally. **Ch-22A** (or 22) is typically used for communication with the Coast Guard and for Coast Guard broadcasts, not for routine ship-to-ship conversations between other vessels.