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> boats going one direction stay to the right, the opposing direction stays to the left.

Wouldn’t that put them head-on? If a southbound boat stays to the right (west side) of a channel and an opposite direction boat stays left (also west side), that seems worse than everyone staying right.

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Everyone stays to the right

Well put, this is way easier to follow than what I wrote ;)

You're flipping the frame of reference for each case which is what makes it confusing. Staring up or down a waterway, opposing traffic are on opposite sides (left or right). From each boats perspective, they are on the right side.

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