Very lovely colours, but I think more sea and less sky would, for me, convey the idea of going on a voyage a little more. Also, I've read the books, seen the photos and worn the T-shirt, but I don't personally like really high or very low horizons. Of course, this might say more about where I am with my photography, which is still very much in development, than the relative merits of this photo's composition.
On the whole a very nice photo but I tend to agree that the composition is slightly problematic; though not so much because of the positioning of the sun and boat - for me that's okay.