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What kind of nautical unit is mt?

I don't see it anywhere on the unit table https://en.wikipedia.org/wiki/International_System_of_Units

its meters. Depth calculations are usually in meters. I think that might even be true in US coastal waters?

I had assumed as much, but wasn't sure.

After all, the US uses not only different units (mi vs km, yards vs meters) but also different symbols for the same units (kph vs km/h, sqm vs m², "klicks" vs km). I've even seen americans use "mt" for metric tons.

US coastal waters use fathoms.

Ah, I was guessing feet, so I couldn't find anything.

Apparently, the US is literally the only country not to use meters for depth: https://en.m.wikipedia.org/wiki/Fathom

Meters

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