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3 WIND B C A Prepared with Memory-Map Figure 3. MM-Nav plot of sample route. Two tacks to close hauled weather (wind from due North) then some 39 off the wind, which would probably eliminate most of the leeway. To correct a DR leg such as A to B for leeway, you plot it the same length but just rotated downwind by the leeway angle. Here the uncorrected leg is at 045T, the corrected leg at = 052T. You have to know what the leeway is for each wind speed and other conditions for your vessel. Usually, it would be the same for both tacks in a given condition, but you might learn that even this is not true if the waves are not running in line with the wind. Note that we can use the small angle rule to estimate how much C will be off of B for 7. The distance A to B is 5.4 nmi. The rule tells us 6 is one tenth offset, which would be 0.54 nmi, but we are a bit higher (7/6)x0.54 = 0.63 nmi. Checking the chart you see the distance from B to C is about 0.68, which is consistent with the approximations.

4 Figure 1. Sailboat wakes... not really showing much! The two left are essentially straight aft. It is light air and they are both cracked off the wind, so we would expect them to be straight. If we were to detect any leeway visually, they would have to be closer to the wind and the wind stronger. In that case, the two lines shown would be leaning somewhat off to the left, upwind. We might still see a few degrees in the ECS track however, even when not at all visible by eye. The top right case is a candidate for showing the effect, but not for certain, it would not be this big. These are race boats and their heading is changing often to match puffs of wind, so we may have caught them off course a bit but this is sort of what it would look like. It would not be this big however (shown is about 17 ) these are high tech boats in what is still relatively light air. They will not slip more than 3 or 4 in these conditions. If you do get the rare chance to actually see this visually, keep in mind that a finger width at arm s length is about 2, which is a crude way to estimate the effect Small angle Rule. A right triangle of 6 has ratio of sides = 1:10, and this can be scaled up to 18 or down to 1, which if often useful in many aspects of marine navigation.

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