Some tips for photographing eclipses at sea can be found by clicking here.
In the past I have always used longer focal length lenses (200mm on up to 1300mm) to get images of the corona and prominences. The view through the eyepieces of a good set of binoculars cannot be captured by modern cameras and after trying over a dozen times I have come to face this reality. I've seen numerous images that are the result of some post processing that attempt to capture that view, but sadly they fail even though they are magnificent.
|2015 Eclipse composite image by Fred Espenak, Mr Eclipse|
|2012 Total Solar Eclipse at sea, wide angle lens|
With luck a video can be made that captures the atmosphere of the eclipse. We'll see!