Against the day that I might actually have to sail the thing, I've started accumulating various bits and pieces that I'll eventually need.
I picked up a marine compass a while back, and a last week I came across this http://www.opticron.co.uk/Pages/trailfinder_ii.htm
Note the Inter Pupillary Distance. 58~77mm. For those who can't get a one size fits all baseball hat to fit, the normal ~72 mm IPD on binoculars leaves you with a very cumbersome monocular, with a spare attached.
Many of the other Binocs with a large IPD were Lecia or Swaroski or Steiner, and the prices were quite exotic.
If you are to look through both eyes at the same time, these may be worth a look, so to say.
The are (to my unpractised eye), pretty good, solid, the focus mechanism is reassuringly free of play, and they have a 5 year guarantee.
I don't have any real experience with Optics, so someone more knowledgeable may pour scorn on my advice, but two eyes able to see at the same time is a huge improvement.
I would have preferred the traditional 7x50, but they were ~74mm IPD, and I could not try them out locally.