A.propeller velocity B.speed of advance C.wake distribution D.wake fraction
A.barometer B.wind vane C.anemometer D.thermometer
A.during the day,three balls in a vertical line B.during the day,three shapes,the highest and lowest being balls and the middle being a diamond C.when making way at night,two all-round red lights,sidelights,and a sternlight D.when making way at night,masthead lights,sidelights,and a sternlight