Let me preface this by stating that I have not looked very far for information on this topic. Honestly, I just did a search for Titanium on Yachtforums and that's about it.

Only mention is small pieces.
Was playing with a beautifully engraved, solid titanium globe of the earth this morning and it just got me to thinking about this....
Is there much use of titanium in yacht manufacture?
It is a very interesting material with many of the attributes of steel with one major advantage, less weight. With the evolution of various alloys and surface preparation via the rather impressive advances in anodising technologies the applications are seemingly endless.