I'm in maritime
We use metric, and imperial, and American, and Maritime.
Ship dimensions tend to be metric.
Ship capacities are usually cubic meters but are often cubic feet, unless they are in American barrels.
Stowage factors can be in Kilos per cubic meter, or pounds per cubic foot, unless its American gallons per American Barrel which means the temperature is probably in Fahrenheit.
Gas however is always cubic meters with a temperature in centigrade.
Fruit is usually in cubic feet with a temperature in Fahrenheit.
Scrap is usually measured in Short tons (907kg) and not in Long tons (1016kg) or Metric tonnes (1,000 kg)
You try to then work out the ETA of a ship travelling at 14 Knots per Nautical mile !
What will the draft be, in meters, if the ship is loaded with 20,000 tons of scrap where the map says the water is 5 fathoms deep ?
Gross/Nett Tons (or more correctly 'tuns') are of course measured in the cubic capacity of medieval wine barrels.