The Objective of this chapter is to define the components of wind on the sail. The apparent wind on the sails is the addition of boat wind, caused by the boat's forward velocity, and true wind, the actual wind conditions.
Understanding the relationship between apparent wind, boat wind, and true wind helps the sailor take advantage of changes in wind speed (puffs or lulls) and direction (shifts)
Maximizing the wind's force on the sail is achieved by finding the proper sail trim angle for the boat heading relative to the apparent wind.
