The Great Lakes are mislabeled, they are really inland seas. They are so big that one end can have very different weather than the other end or even the middle. Waves however don’t really care where they come from and can travel hundreds of miles, reflecting off hard coastlines. Shallow waters amplify the waves by making for a shorter period; this can create little waves that brings the boat to a complete stop as it goes up and down pounding against a wall of water. Similarly, one end of the lake may be experiencing 20+kts of wind and the other end could be in a dead calm with waves that originated from the other end. Makes it tough to know what the conditions are for your journey, so when its good take advantage of it, it will likely change.
To all those who insist on paper charts as a backup to electronics, “what good are they in fog?” What was a surprise to us was the frequency of fog on the lakes, it wasn’t anticipated by us, seemed like a New England issue not a lake issue. But the water is cold (60s in the big water) and the air is warm which is perfect for dense fog. We learned at the shipwreck museum that a large percentage of ship wrecks on the Great Lakes are ships driving into other ships, mostly in dense fog. Radar, GPS, electronics charts and AIS should mostly preclude this cause of shipwrecks. We expected the number one cause for shipwrecks to be bad weather (think Edmond Fitgerald) but bad weather only accounted for ¼ of so of great lakes shipwrecks. With far better forecasting today, this too shouldn’t be an issue like it used to be. But back to our story, without radar, we played our fog horn, set a watch on the bow, watched the AIS for ships (we could see them ...
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