air draft

(nautical) The distance from the surface of the water to the highest point on a vessel

Japanese Meaning

水面から船舶の最高点までの距離

Before passing under the low bridge, the captain measured the ship's air draft to confirm there was enough clearance.

低い橋を通過する前に、船長は安全に通れるか確認するために船の水面から最も高い点までの高さを測った。

Sense（1）

(nautical) The distance from the surface of the water to the highest point on a vessel

air drafts

（ plural ）