NS100

1
NS100

• Fundamentals of
• Naval Science

Inland Rules of the Road III
2
Objectives
1. Know when the navigation lights are to be
operated (Rule 20). 2. Know the arc and required
range of visibility for navigation lights
(Rule 21 - 22). 3. Know the color and flashing
periods of all special flashing lights (Rule
21). 4. Know the lighting configuration of all
vessels under inland rules (Rule 23-30).
3
Lights and Shapes (Rule 20)
1. The rules in this part shall be complied with
in all weather. 2. The rules shall be complied
with from sunset to sunrise, and during such
times as no other lights shall be exhibited which
would obstruct or be mistaken for navigational
lights. 3. The rules concerning shapes shall be
complied with by day
4
Definitions (Rule 21)
Light Color Arc of visibility Masthead
light White 225 deg, from 22.5 deg abaft
the
beam on both sides Port sidelight Red From
directly ahead (000 R)
to 22.5 deg abaft PORT
beam Starboard sidelight Green From directly
ahead (000 R)
to 22.5 deg abaft STBD
beam Stern light White 135 deg, from 22.5 deg
abaft
the beam circling astern to
22.5 deg
abaft the beam on
the other side
5
Arcs of Visibility
All-around Lights
360
112.5
112.5
360
360
135
6
Definitions (Rule 21)
Light Color Arc of visibility Towing light
Yellow Same as stern
light All-around light Various 360 deg
unbroken Flashing light Various Flashes at
regular intervals
120 flashes per minute Special
flashing light Yellow Flashes at regular
intervals 50-
70 flashes per minute, placed
as
far forward as possible
between 180 deg and 225
deg
in arc, with no part exceeding
22.5 deg
abaft the beam.
7
Visibility of Lights (Rule 22)
Vessel gt 50 m
Masthead
Sidelight/ Sternlight
All around
Towing Flashing
Special
6 nm
3 nm
3 nm
3 nm
2 nm
8
Visibility of Lights (Rule 22)
Vessel 20m - 50 m
Masthead
Sidelight/ Sternlight
All around
Towing Flashing
Special
5 nm
2 nm
2 nm
2 nm
2 nm
9
Visibility of Lights (Rule 22)
Vessel 12m - 20m
Masthead
Sidelight/ Sternlight
All around
Towing Flashing
Special
3 nm
2 nm
2 nm
2 nm
2 nm
10
Visibility of Lights (Rule 22)
Vessel lt 12m
Masthead
Sidelight/ Sternlight
All around
Towing Flashing
Special
2 nm
1 nm
2 nm
2 nm
2 nm
11
Lighting of Vessels Underway (Rule 23)
Power Driven Vessel gt50m
Masthead
Sidelight Sternlight
All around
Flashing
Second Masthead
X
X
X


X
12
Lighting of Vessels Underway (Rule 23)
Power Driven Vessel lt50m
Masthead
Sidelight Sternlight
All around
Flashing
Second Masthead
X

X


X
13
Lighting of Vessels Underway (Rule 23)
Power Driven Vessel lt20m
Masthead
Sidelight Sternlight
All around
Flashing
Second Masthead
X

X


X
Note A power driven vessel lt20m need not show
the masthead light forward of midships, but
should show it as far forward as possible.
14
Lighting of Vessels Underway (Rule 23)
Power Driven Vessel lt12m
Note A power driven vessel lt12m may substitute
an all around white light in lieu of an aft
masthead and sternlight.
15
Lighting of Vessels Underway (Rule 23)
Air Cushion Vessel - Displacement Mode
Masthead
Sidelight Sternlight
All around
Flashing
Second Masthead
X

X


X

16
Lighting of Vessels Underway (Rule 23)
Air Cushion Vessel - Non-displacement Mode
Masthead
Sidelight Sternlight
All around
Flashing
Second Masthead
X

X

Y
X

17
Lighting of Vessels Towing or Pushing (Rule 24)
Vessels engaged in towing
Masthead
Sidelight Sternlight
Second Masthead
Towing vessel length Length of Tow
lt50m lt200m

W/W

Y/W

X
18
Lighting of Vessels Towing or Pushing (Rule 24)
Vessels engaged in towing
Masthead
Sidelight Sternlight
Second Masthead
Towing vessel length Length of Tow
lt50m gt200m

W/W/W

Y/W

X
19
Lighting of Vessels Towing or Pushing (Rule 24)
Vessels engaged in towing
Masthead
Sidelight Sternlight
Second Masthead
Towing vessel length Length of Tow
gt50m gt200m

W/W/W

Y/W
W
X
20
Lighting of Vessels Towing or Pushing (Rule 24)
Vessels engaged in towing
Masthead
Sidelight Sternlight
Second Masthead
Towing vessel length Length of Tow
gt50m lt200m

W/W

Y/W
W
X
21
Lighting of Vessels Towing or Pushing (Rule 24)
Vessel Engaged in Pushing - lt50m
Flashing
Masthead
Sidelight Sternlight
Second Masthead


W/W

X
Y/Y
22
Lighting of Vessels Towing or Pushing (Rule 24)
Vessel Engaged in Pushing - gt50m
Flashing
Masthead
Sidelight Sternlight
Second Masthead


W/W
W
X
Y/Y
23
Lighting of Vessels Towing or Pushing (Rule 24)
Composite Unit - lt50m
Flashing
Masthead
Sidelight Sternlight
Second Masthead


W

X
X
24
Lighting of Vessels Towing or Pushing (Rule 24)
Composite Unit - gt50m
Flashing
Masthead
Sidelight Sternlight
Second Masthead


W
W
X
X
25
Lighting of Vessels Towing or Pushing (Rule 24)
Vessel Towing Alongside - lt50m
Flashing
Masthead
Sidelight Sternlight
Second Masthead


W/W

X
Y/Y
26
Lighting of Vessels Towing or Pushing (Rule 24)
Vessel Towing Alongside - gt50m
Flashing
Masthead
Sidelight Sternlight
Second Masthead


W/W
W
X
Y/Y
27
Lighting of Vessels Towing or Pushing (Rule 24)
Pushed Tow
Flashing
Masthead
Sidelight Sternlight
Second Masthead

Y


X

28
Lighting of Vessels Towing or Pushing (Rule 24)
Vessel Being Towed
Flashing
Masthead
Sidelight Sternlight
Second Masthead



X
X
29
Lighting of Vessels Towing or Pushing (Rule 24)
Vessel Being Towed Alongside
Flashing
Masthead
Sidelight Sternlight
Second Masthead




X
X
In an inconspicuous, partly submerged vessel or
object being towed A WHITE ALL ROUND LIGHT -
3 NM VISIBILITY
30
Lighting of Sailing Vessels Underway and Vessels
Under Oars (Rule 25)
Sailing Vessel Underway
Tasking Lights
Masthead
Second Masthead
Sidelight Sternlight

R/G



X
X
Sailing vessels lt 20m may combine sidelights
and sternlight in a single lantern atop the mast.
Red over green tasking lights may be displayed.
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Lighting of Sailing Vessels Underway and Vessels
Under Oars (Rule 25)
Sailing Vessel Underway
32
Lighting of Sailing Vessels Underway and Vessels
Under Oars (Rule 25)
Sailing / Under Oars - lt7m
Tasking Lights
Masthead
Sidelight Sternlight
Second Masthead

R/G


X
X
Task lights are 360 deg all around visibility.
Sailing vessels or small vessels under oars
require only a flashlight or lantern.
33
Lighting of Fishing and Trawling Vessels Underway
(Rule 26)
Fishing - lt50m
Tasking Lights
Masthead
Sidelight Sternlight
Second Masthead

R/W

X
X
Task lights are 360 deg all around visibility.
34
Lighting of Fishing and Trawling Vessels Underway
(Rule 26)
Fishing - gt50m
Task lights are 360 deg all around visibility.
35
Lighting of Fishing and Trawling Vessels Underway
(Rule 26)
Trawling - lt50m
Task lights are 360 deg all around visibility.
36
Lighting of Fishing and Trawling Vessels Underway
(Rule 26)
Trawling - gt50m
Task lights are 360 deg all around visibility.
37
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Not Under Command
Task lights are 360 deg all around visibility.
38
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Restricted in Ability to Maneuver - lt50m
Task lights are 360 deg all around visibility.
39
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Restricted in Ability to Maneuver - gt50m
Tasking Lights
Masthead
Sidelight Sternlight
Second Masthead

R/W/R
W
W
X
X
Task lights are 360 deg all around visibility.
40
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Vessel Engaged in Dredging - lt50m
Dredging vessel displays red over red on
obstructed side, green over green on clear side.
41
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Vessel Engaged in Dredging - gt50m
42
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Vessel Engaged in Diving Operations - lt50m
Task lights are 360 deg all around visibility.
43
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Vessel Engaged in Diving Operations - gt50m
Task lights are 360 deg all around visibility.
44
Lighting of Vessels Not Under Command or
Restricted in Ability to Maneuver (Rule 27)
Vessel Engaged in Mine Sweeping Operations - lt50m
45
Lighting of Vessels Constrained by Draft (Rule
28)
Vessel Constrained by Draft - lt50m
Task lights are 360 deg all around visibility.
46
Lighting of Vessels Constrained by Draft (Rule
28)
Vessel Constrained by Draft - gt50m
Task lights are 360 deg all around visibility.
47
Lighting of Piloting Vessels (Rule 29)
Piloting Vessels - lt50m
Task lights are 360 deg all around visibility.
48
Lighting of Piloting Vessels (Rule 29)
Piloting Vessels - gt50m
W
Task lights are 360 deg all around visibility.
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Questions ?