If you learn how to move with the boat, you can compensate for the boat's movement and then binos aren't all that hard to use... If I can use a 300 mm camera lens aboard a moving boat, you can surely use a set of binocs.

If you're sitting, you're basically screwed... you can't move enough to absorb the motion of the boat... so you need to really stand. Larger binocs work better IMHO, since they tend to move less... but they can't be much more than 7x magnification, or the magnification works against you.
I'd also second Byron's idea... provided they don't have a large deck ape watching over them... deck apes can be dangerous.

__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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