Note 3 — SEA POWER UPON HISTORY.
Reading edition
A ship was said to have the weather-gage, or "the advantage of the wind," or "to be to windward," when the wind allowed her to steer for her opponent, and did not let the latter head straight for her. The extreme case was when the wind blew direct from one to the other; but there was a large space on either side of this line to which the term "weather-gage" applied. If the lee ship be taken as the centre of a circle, there were nearly three eighths of its area in which the other might be and still keep the advantage of the wind to a greater or less degree. Lee is the opposite of weather.