What under keel clearance means—and why UKC matters. ⚓️ #CaptainTJ

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Alright Crew — it’s Mariner Monday, and today we’re breaking down a term every sailor should know: Under Keel Clearance (UKC).

UKC is simply the distance between the bottom of your ship and the bottom of the lake or river.
On the Great Lakes, that number can get… let’s call it exciting.

Most companies use a minimum standard:
• 6 inches over a soft bottom
• 12 inches over a hard bottom
Because one is like brushing mud…
and the other is like finding a heavy coffee table with your little toe.

Captains calculate UKC using:
• Charted depth
• Minus the ship’s draft
• Adjusted for squat
• Plus or minus whatever the water levels are doing that day

If the math goes wrong?
You become internet famous — just not the good kind.

So when captains talk about UKC, we’re really just evaluating how confidently we’re going to float over Mother Nature’s furniture today.

Want the deeper dives, full maritime lessons, and Great Lakes content?
Come aboard my YouTube channel: Captain TJ.

#CaptainTJ #MarinerMonday #ShipHandling #GreatLakesShipping #MaritimeKnowledge