After years of researching I found an independant birding site on the web that did side by side comparisons of binoculars which concluded that the Leica 8x32 Trinovid had superior light-gathering ablility, due to superior coatings, than much larger 7x50 binoculars. Mine work at -40C, which one cannot say about a lot of things. They are not as impact-resistant as individual eye-piece focus military binoculars like the Fujinons, but they are incredible glasses to use over long periods of time. I use mine to judge bear body language at a safe distance. I can't help with the Ultravids as I have no experience with them. I use my 8x32's occasionally on a tripod with a simple piece of dead truck innertube as a big elastic band. If you will be at sea the bigger exit pupil of the 7x42 or 8x42 means it is easier to keep the image in the field of view if you are moving or your hands are unsteady. Enjoy the view!
filmbeargun