A sailboat can go anywhere, but not always directly
As you probably noticed on the previous page, there's no boat sailing straight upwind
Indeed, this would be physically impossible
Though, a sailboat can still sail in the opposite direction of the wind by following an indirect route
This consists in sailing as "close" to the wind as possible, switching left and right to finally reach a point straight upwind
This technique is called tacking and requires that you approximately sail 45° off the wind's bed ( for a regular single hull keel boat )
The area encompassed within 45° on each side off the wind is called "no-sail zone" and obviously equals to a total of 90°
The above figure is definitely the most important image you should keep in mind all along your sailing career
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