My trusty 30 year old Radio Shack PRO-38 scanner only has room for ten frequencies. Here are my top ten picks for marine channels to listen to. You can have a lot of fun monitoring to ship to ship and ship to shore communications especially if you are near a big body of water (like Long Island Sound or Lake Huron.) Ahoy matey!
156.130 Channel 6 Intership Safety
156.450 Channel 9 Boater Calling
156.800 Channel 16 Distress, Safety and Calling
157.100 Channel 22A Coast Guard Safety Information Broadcasts
157.150 Channel 23 A Coast Guard
then five channels of intership communications:
156.425 Channel 68
156.475 Channel 69
156.575 Channel 71
156.625 Channel 72
156.925 Channel 78A
Good sailing!