Have a look on the Raymarine site <A target="_blank" HREF=http://www.raymarine.com>http://www.raymarine.com</A> under Enter/Customer Support/Owner Manuals/Retired Products - you should see it there.
Now I can get the little bugger to stop tweeting all night by pressing two buttons at once, it was really doing my head in, and I couldn't figure out howe to stop it.