the port side of the proximate vessel the operator of the marine vessel would move the directional actuator 28 in a downward direction to a second position in the second position the sound controller 42 and the light controller 40 detect the movement of the directional actuator 28 and generate predetermined sound and light signals that are communicated to the sound source 26 and the light source 22 the predetermined sound signal in accordance with inland rules comprises a first sound signal consisting of two prolonged blasts and one short blast each prolonged blast having a duration ranging from about four to about six seconds and each short blast having a duration of approximately one second and a first light signal that is approximately equivalent in duration to and is synchronously actuated with the first sound signal alternatively to indicate a maneuver to the port side of the proximate vessel in accordance with colregs the operator of the marine vessel would move the directional actuator 28 in a downward direction to a second position actuating a second sound signal comprising two prolonged blasts and two short blasts of said sound source 26 each prolonged blast having a duration ranging from about four to about.