It is after sunset and getting dark but you can still discern two separate and unrelated vessels underway in the distance. Both vessels appear about 30-ft in length.<br /><br />1- One vessel is displaying the usual red and green sidelights, and the usual white masthead and stern lights, and an additional yellow flashing light. Is this an appropriate display of navigation lighting and if so, what do you know about this vessel?<br /><br />2- The other vessel is displaying only a single white all-around light. Is this an appropriate display of navigational lighting and of so, what do you know about this vessel?