I've said before that I don't like wearing a hood. I started diving with no wetsuit, and when I started using a wetsuit it was always without a hood. I've since tried wearing a hood a few times on cold days and always felt restricted and unable to sense the environment properly. This is probably partly psychological but mostly due to the inability to hear. I figure I lose about %90 of my hearing wearing the hood. I tried putting holes in the hood at the location of the ears but it didn't help much. Until now my reasons for not wearing a hood have been personal. I concluded that it's a trade off between feeling comfortable hearing stuff and being cold. I figured that when it gets cold enough the cold factor will override the loss of hearing and I'll do like everyone else. But I didn't take one thing into consideration.
Diving out of Miami the biggest danger to us is boats. I've been buzzed by boats countless times, a few times as close as 30ft. Once I had to stay down longer to let the boat pass directly over me. My main defense against boats is early detection. I've developed a pretty good feel for when the boat is near, far, getting closer or moving further away by listening to the sound of the motor. I've learned to distinguish between the sound of airplanes and boat engines, sometimes they can sound similar. When I'm pretty sure the boat is far off I don't even raise my head out of the water. It's become somewhat automatic that I can distinguish the sound of a boat that can be a risk to me. It's important to never get complacent about the sound of a boat motor. This does impede relaxation and often does not allow diving to my full potential. It most often happens diving from the beach while crossing what I call no man's land; the line between the beach buoys and the second reef which many boats prefer to take. It is especially dangerous on weekends and holidays due to the increased boat traffic, I refuse to beach dive on such days.
To make a long story short I was diving with a hood. I wasn't hearing anything and then suddenly I felt something which I perceived as a faint buzzing in my throat area. It didn't sound like anything I've ever heard before but it made me instinctively raise my head out of the water. What I saw was a boat at full speed heading right towards me. It was maybe 100ft away at that point and all I could do was stare at it in disbelief. The boat then passed 20 feet away from me and never slowed down. It was a surreal moment. I used to have thoughts of diving to avoid an oncoming boat in just such a situation, believe me when I say there was no chance of that. The best chance we have of avoiding a boat is noticing it early on, judging its trajectory correctly, and taking early evasive action. IMO the hood significantly cuts down the possibility of doing that. When diving in an area where boat boat traffic is a constant reality I believe wearing a hood is dangerous.