Use VFH Channels 13 and 16 to monitor "security calls" from commercial vessels in the area. Only contact freighters in an emergency. 

Avoid ship channels when possible; if you must cross a channel, do so as quickly as possible.

Know whistle signals: 5 or more blasts mean danger.

Be seen, especially at night.  Display your navigation lights and light your cabin and sails if needed for better visibility.  Great Lakes shipping is a 24/7 industry.

Always stay distant from a freighter's bow and stern.  The wake and wash from propellers and thrusters can quickly destabilize small crafts.

Do not tie up to another recreational vessel and "raft" out into the navigation channel.

Avoid clustering around a bridge when waiting for it to open for a commercial vessel.

Always wear a personal flotation device. If you're paddle boarding or kayaking when the lake is cold, wear a wet suit too!