Can you believe it was only after I researched this tip that I took a closer look at my camera and found that it already has the grid setup? At least now I know what it is there for even if I still struggle to get the composition right!
The rule of thirds might as well be called the golden rule of photographic composition. Ideally an image should be divided up into thirds both horizontally and vertically, and the important elements of the image should fall on or close to the intersections. Aligning key compositional elements of the image with these intersection points will make an image more interesting.
Like all things to do with underwater photography more, this is more easily achieved using static subjects when starting out. Try placing the point of interest in your subject at one of the intersections of the grid, and take more than one shot! Experiment by moving the subject point to different parts of the frame and you’ll begin to learn just how much placement can have an impact on the image.