... First...Store equipment in a dry bag or waterproof case like a Pelican when not out in use. That protects it from both rain and dunking and will float...
Dear dwswager,
I've no doubt your advice is offered with the best intentions, and forgive me for asking, but have you ever been out in 'serious shit' ?
Of course the OP isn't clear as to whether she's fair weather sailing or potentially out in what might euphemistically be described as 'variable conditions' and possibly in a competitive environment
Assuming the latter, the fastest way to get thrown overboard is to come along with a Pelican case. If you insist on doing so, make sure it's large enough to use as a life raft - you'll need it. Sailors don't appreciate extra luggage (particularly not when racing).
Secondly, the rain covers etc are all very nice and pretty, but what you need to factor in is the likelihood of getting dunked in a wall of sea water crashing over the boat, either because the weather is bad or 'cos the driver has just buried the bow in a wave. The sort of dunking where water is running inside your clothing and down your back, where you're sodden throughout, where the hatches are closed to prevent ingress of water and the only thing on your mind is when do I get back on shore etc etc etc. Dry anything is but a distant memory.
At times like these, which occur far more frequently than people envisage, simple is best - forget niceties. Salt water and electronics don't mix - and if Nikon find a trace of salt water inside their cam, your guarantee isn't worth a sodden rag !
I could go on, but I hope you've caught my drift ...
For adverse conditions , think of the yachting escapade in Wolf-of-Wall Street.
Of course, if Marie's only out for a sail on a pond, then your 5$ rain cover will suffice ...
[/Written in a light hearted vein and without any wish to cause offence.]
M