I don't remember what Bruce put in his book, but as you approach an island say from the north with an east wind
, there is an acceleration zone up to 5 nm off the northern end of the island that lasts until you are behind the island.
- - The winds "wrap around" the island and the direction of the wind
changes accordingly. Also the "wrapping around" tends to increase the wind velocity while you are in "cape effect" and then once you get behind the island the wind decreases dramatically. You can see the effect on the surface of the water
as you approach.