preposition
or broad on
: on a bearing about 45 degrees from a fore-and-aft line at (the bow or stern)
broad off the port bow
broad on the starboard quarter
preposition
or broad on
: on a bearing about 45 degrees from a fore-and-aft line at (the bow or stern)
broad off the port bow
broad on the starboard quarter
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012