I have the WindGuru app on my phone and went to download it from the app store on my husband's phone this morning. Learned it's no longer available (did a little google search to confirm that). As a replacement, we downloaded Windy which seems to be a pretty good - maybe better - replacement. Haven't used it in the BVI's yet, but will be using it tomorrow on our trip through the Straights of Mackinac.
Just a heads up if you're looking for it!
Julie