noun
boat length (unit); distance between boats
Used in boat racing to measure the gap between boats, similar to 'length' in horse racing. The term 艇身 is a synonym.
See also: 艇身
ゴール前で艇差が縮まった。
The distance between the boats narrowed before the finish line.
彼の艇は2艇差で勝った。
His boat won by two boat lengths.