In making ‘prosumer’ camcorders smaller and more streamlined, Sony moved the microphone(s) to a position on the top — an ideal spot for catching wind noise. Apart from adding an external microphone (not the most convenient thing to do while travelling) there was nothing one could do. I then saw that Micromuff had started to produce one of their stick-on wind mufflers for camcorders as well as DSLRs. I got one immediately and fitted it in time for a passage up the Mekong in northern Laos and in the mountains of Yunnan. And did the Micromuff work? Yes, brilliantly. There was an enormous reduction in wind noise.
My Sony HDR-XR550 wearing its Micromuff