After our first long passage to Panama we quickly realized having a cord attached to a phone/Kindle/iPad is not a wise idea. When we have to jump into action the last thing we want to worry about is knocking the phone off into the ocean or getting a long cord caught around a winch.
With wireless headphones listening to a podcast or dancing like no body is watching on passage is way less cumbersome. Plus, they are waterproof so they can handle the humid, salty environment.
We have two brands and they both work well, the Anker has little magnets which are great when you take them out of your ears, but the battery life on the Bluephonic seems better.