aka, I to have comparied several of the sites and have found about the same accuracy between SI & MSW. I have found that on a short period wind swell SI can be more accurate at times. Ground swell prediction is the same on both sites. Bottom line is all these sites are great tools, but you still have to have a bit of local knowledge and check it in person if you don't want to miss a chance. This is especially true around these parts with so much wind swell which can turn on or off on very short notice.
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