I smashed my nose against the companionway during a Bermuda race in the late '80s, and I have trouble keep air equalized in a normal dive mask. This snorkel mask works great for me and I can breath normally. The fit is good for me, especially now that I shaved off my beard!
It’s been a long time coming but we now see tangible progress emerging to reduce our dependence on fossil fuel. If the U.S. Navy can prove that it works, isn’t it about time the concept of the modern cruising boat includes hybrid forms of propulsion?