Sorry by the time a left to reply your question.
When you tell me that it was a smal region crop I understand a piece of focus issue you get. Many people here thought like me about the focus. I do a boat shoot too for this challenge, and know how it is complex.
To capture a moving subject you has two options:
1) Panning, this is technique that consists to follow the subject with the camera before, during and after the shoot. It´s not simple as seems. You need to mantain the horizon line and speed of your moving. Don´t use all telefoto, put your apperture as you can get a slow shuter speed (typical 1/focal lenght - 1 or two stops). I pratice it using two eyes opened to see real subject and compensate for the black time of shutter-release.
2) High shutter speed with all stoped down apperture (small f numbers). A tripod is highly recomended too. It must requires a huge telefoto lens. But this your camera has.
This apply to all moving subjects. Near or far it will work but nearest subjects is the goal to any good photos. You are able to catch far subjects as near using huge telephoto lens. Good lucky at next time.
No sharpness in this image. I guess that you are in a boat too. Camera vibration is a huge trouble to get sharp pictures. An alternate is to use the higher apperture possible and higher shutter speed.
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