Dont know about the 4, but when I was having some problems with MME and my 3, they recommended that the missions be flown cross wind. Wind wasn't the problem in my case, but thats another thread! I've flown successful MME missions with upper winds as strong as 15-20 MPH. Wouldn't expect a gust to affect more than 1-2 pictures which would easily be accounted for in the processing.