Experiment to see what looks best. This is another instance where taking lots of photos will pay off. It s important not to have too much blank space in the foreground or background. Focus on the boat if that s your emphasis. Take both horizontal and vertical shots.
Some subjects look better vertically, some horizontally.
Look through your viewfinder to see which looks best. If in doubt, take it both ways and decide later which is better. Use slide film, not print. Although many newspapers and magazines will accept prints, most prefer slides because they are sharper, give better color, and reproduce better when published. Most professional photographers take slides.