Sailing is the primary means of travel on the planet of Terra, and the characters may wish to engage in sailing as a part of their adventures. There is a lot of reference material available on the details of sailing, Wikipedia's sailing page is a good start

For the purposes of this game, I have created some simplified mechanics for sailing to facilitate smooth gameplay

Knots
Knots can refer to wind speed or boat speed, and is usually used to indicate nautical miles per hour. For simplicity, nautical miles will be treated as if they were miles, despite the fact that they would not be the same on a planet of Terra's size

Wind Speed
You can use the following table to generalize wind conditions