1	NAVIGATION RULES -INLAND- LIGHTS & SHAPES Inland Navigation Rules Act of 1980 Rules 20 through 31
2	Disclaimer The Rules presented in this program are an overview of summarized versions of the Inland Navigation Rules. This program should not be considered a substitute for a complete version of the entire Inland Navigation Rules. The summarized rules in this program could be interpreted differently than the complete rules of the Inland Navigation Rules.
3	Application of Lighting Rules (Rule 20) Lighting rules shall be complied with: in all weather from sunset to sunrise local time sunrise to sunset in restricted visibility all other times it is deemed necessary
4	Application of Lighting Rules (Rule 20) No other lights shall be displayed except lights that: cannot be mistaken for required lights do not impair visibility of required lights do not interfere with keeping a proper look-out
5	Definitions for Lighting (Rule 21)
6	Visibility of Lights (Rule 22)
7	Zones
8	Power-Driven Vessel Underway (Rule 23) Vessels less than 20 meters (65.6 feet)
9	Power-Driven Vessel Underway (Rule 23) Vessels less than 12 meters (39.4 feet)
10	Sailing Vessel Underway (Rule 25) Vessels less than 20 meters (65.6 feet)
11	Sailing Vessel Underway (Rule 25) Vessel less than 7 meters (23 feet) Exhibit same lights as larger sailing vessels if practical. If not practical, exhibit an electric torch or lantern showing a white light in time to prevent collision.
12	Vessel Under Oars (Rule 25) May exhibit lights for sailing vessels or have ready at hand an electric torch or lighted lantern showing a white light in time to prevent collision.
13	Vessel at Anchor (Rule 30) Vessel at anchor (less than 50 meters) Except: a vessel less than 20 meters (65.6 feet) at anchor in a special anchorage a vessel less than 7 meters (23.0 feet) at anchor and not in a narrow channel, fairway or where other vessels normally navigate
14	Power-Driven Vessel Underway (Rule 23) Typical of Great Lakes freighter
15	Vessel Pushing (Rule 24) Typical of Ohio River barges
16	Vessel Towing (Rule 24) Object being towed
17	Vessel Aground (Rule 30) Vessel aground (less than 50 meters)
18	More Lights Vessel not under command (Rule 27) Vessel restricted in maneuverability (Rule 27)
19	More Lights Vessel engaged in diving (Rule 27)
20	Day Shapes In addition to lights, some vessels are required to display shapes to indicate a special circumstance Example: A vessel towing with severely restricted maneuverability displays 2 balls and 1 diamond in a vertical line (Rule 27)
21	Day Shapes Sailing vessels under sail and power must display a cone shape, apex facing down except a vessel less than 12 meters (39.4 feet) is not obliged
22	Day Shapes A vessel at anchor must display a ball on the forward part of the vessel, except: a vessel less than 20 meters (65.6 feet) at anchor in a special anchorage a vessel less than 7 meters (23.0 feet) at anchor and not in a narrow channel, fairway or where other vessels normally navigate
23	Day Shapes A vessel restricted in its ability to maneuver shall display 2 balls and 1 diamond in a vertical line. A vessel not under command shall display 2 balls in a vertical line. Vessels less than 12 meters are not required, except when engaged in diving.
24	Day Shapes If the size of a vessel engaged in diving makes it impracticable to display shapes for restricted ability to maneuver, it shall display a rigid replica of the code flag “A”.
25	Day Shapes A vessel engaged in fishing shall display 2 cones in a vertical line with apexes together
26	Day Shapes A vessel aground shall display 3 balls in a vertical line, if practicable
27	Day Shapes