I like switching from paint to pencil when I'm sketching on location. It's easy to overlook the fun of pencil and be lured into paint. But pencil, even in its elemental simplicity, lends itself to painterly effects, too.
I'm interested in all the rigging, but I'm also trying to convey the blinding light in the bay. I partially erase the lines that cross those hot reflections in the water, and I add a softening sfumato or enveloping tone, smudged with my thumb, to the area where the hull meets the water.