For boating or any marine use, waterproofing is critical. The housing
should be solidly built enough that it can take some punishment when it
gets really rough. A power of 7 with a 50mm objective lens is most
common for a marine binocular. This allows for a large field-of-view
and an ample objective to collect a lot of light. Another feature of
many marine type binoculars is a built in compass, perfect for
navigation.
