I've caught some flack for this...
Suggestion: Blank out the name on the transom, and any registration
numbers. (And don't link from other peoples websites when asking the question... that was my oops. Gotta ask for permission!)
As far as taking the picture: If its on public property or in a public space, you can take a picture of whatever you see. Private property things are a little different, same as if they are prancing about naked down below... or any time someone would expect to be having a private moment... even if you can see them from a public space. (I took a broadcasting class a couple years ago, I think that covers the basics on taking the picture. Generally photography
falls under art you've made... unless its private property, privacy, or national security