TOWING ASTERN - INTERNATIONAL AND INLAND

w>                                          

w>                                          

     sidelights                          

                              <Y

                                                  <W                    

YELLOW OVER WHITE, TOWING AT NIGHT

TOWING ASTERN > 200 METERS

 w>   BIG

     w>   LONG 

   w>   TOW

+ ◊

ADD 1 MASTHEAD LIGHT AND DIAMOND DAYSHAPE

INTERNATIONAL TOWBOAT AHEAD OR ALONGSIDE

w>       

w>       

                 sidelights

                                                 sternlight  <w

NO YELLOW LIGHTS

INTERNATIONAL TOW PACKAGE LIGHTS

PUSHED AHEAD  - FORWARD SIDELIGHTS

ALONGSIDE - FORWARD SIDELIGHTS + STERNLIGHT

INLAND TOWBOAT LIGHTS

PUSHED AHEAD OR ALONGSIDE

w>                    

w>                    

sidelights

                                       towlights      < Y

                                                         < Y

Yellow over Yellow, I'm a pushing fellow

INLAND TOW PACKAGE AHEAD OR ALONGSIDE

AHEAD

Y>   Special Flashing Light                            

Sidelights                 

ALONGSIDE    

Y>   Special Flashing Light                           Sidelights               

                                   Sternlight    <w

TOWING ON WESTERN RIVERS N of HUEY P LONG BRIDGE

NO MASTHEAD LIGHTS REQUIRED

  Y>    SPECIAL FLASHING ON FRONT                        

         TOW LIGHTS ON STERN  < Y

                                          < Y

PARTIALLY SUBMERGED/INCONSPICUOUS TOW

< 25 m - 1 all-around light at each end

Towboat MAY direct a searchlight toward tow

RANGE OF TIDE

DIFFERENCE BETWEEN HIGH/LOW TIDE

SPRING TIDE

HIGHEST OF HIGHS, LOWEST OF LOWS

NEAP TIDE

"SCANTY"

1st and 3rd quarter of moon phase

smallest tide range

FLOOD TIDES

WATER MOVES TOWARD LAND/SHORE

EBB TIDE

WATER MOVES AWAY FROM SHORE

STAND OF TIDE

NO VERTICAL RISE OR FALL

SLACK TIDE

NO HORIZONTAL FLOW (slack water)

SOUNDING DATUM

MEAN LOW WATER

depicts depth of water collected over time

MEAN HIGH WATER

Topographical features are measured from Mean High Water

to show clearance from high water to bridges, etc

HEIGHT OF TIDE

DIFFERENCE BETWEEN DEPTH AND AREA'S TIDAL DATUM

NAVIGATIONAL BOUY CHARACTERISTICS

R C

E O

N G

T S

RED                        CANS

          EVEN                       ODD           

  NUNS                       GREEN

    TRIANGLE                 SQUARE

LIGHT REQUIREMENTS FOR SMALL VESSELS

<  12 METER BOATS

< 7 METERS AND < 7 KNOTS

< 12 METERS

ALL AROUND WHITE LIGHT + SIDELIGHTS

< 7 METERS AND < 7 KNOTS

ALL AROUND WHITE LIGHT

+ sidelights when practicable