NAVIGATION
RULES
Sound
and
Light Signals
Inland
COMO Lew Wargo
DSO-OP (9ER)
14 March 2015
NAV RULES SOUND & LIGHT SIGNALS
REFERENCES
Navigation Rules
International - Inland
COMDTINST M16672.2(series)
SOUND & LIGHT SIGNALS
1. What size vessel must carry both a whistle
and a bell?
A. Equal or more than 7 meters
B. Equal or more than 10 meters
C. Equal or more than 12 meters
D. Equal or more than 20 meters.
SOUND &
LIGHT SIGNALS
1. What size vessel must carry both a whistle and a
bell?
A. Equal to or more than 7 meters.
B. Equal to or more than 10 meters.
C. Equal to or more than 12 meters.
D. Equal to or more than 20 meters.
SOUND &
LIGHT SIGNALS
2. When power driven vessels are in sight of
one another and meeting or crossing they
must signal if within what distance?
A. 100 yards
B. 200 yards
C. ½ mile
D. 1 mile
SOUND &
LIGHT SIGNALS
2. When power driven vessels are in sight of
one another and meeting or crossing they
must signal if within what distance?
A. 100 yards
B. 200 yards
C. ½ mile
D. 1 mile
SOUND &
LIGHT SIGNALS
3. Which of the following whistle signal is correct?
A. One short blast means I am altering course to
port and will leave you on my starboard side.
B. Two short blasts means I am altering course
to starboard and will leave you on my port
side.
C. One short blast means I am altering course to
starboard and will leave you on my port side.
D. Three short blasts is a danger signal.
SOUND &
LIGHT SIGNALS
3. Which of the following whistle signal is correct?
A. One short blast means I am altering course to port
and will leave you on my starboard side.
B. Two short blasts means I am altering course to
starboard and will leave you on my port
side.
C. One short blast means I am altering course
to starboard and will leave you on my port
side.
D. Three short blasts is a danger signal.
SOUND &
LIGHT SIGNALS
4. Three short blasts on a whistle means:
A. I am at anchor
B. I am aground
C. Danger
D. My engines are in astern propulsion
SOUND &
LIGHT SIGNALS
4. Three short blasts on a whistle means:
A. I am at anchor
B. I am aground
C. Danger
D. My engines are in astern propulsion
SOUND &
LIGHT SIGNALS
5. The danger signal on a whistle is:
A. Three short blasts
B. Four short blasts
C. Five or more short blasts
D. None of the above
SOUND &
LIGHT SIGNALS
5. The danger signal on a whistle is:
A. Three short blasts
B. Four short blasts
C.Five or more short blasts
D. None of the above
SOUND &
LIGHT SIGNALS
6. A light used to supplement whistle signals is:
A. An all-round white
B. An all-round yellow
C. A light with a range of 2 miles
D. May be either an all-round white or yellow
light with a range of 2 miles.
SOUND &
LIGHT SIGNALS
6. A light used to supplement whistle signals is:
A. An all-round white
B. An all-round yellow
C. Light with a range of 2 miles
D. May be either an all-round white or
yellow light with a range of 2 miles.
SOUND &
LIGHT SIGNALS
7. What signal does a vessel give when nearing
a bend in a narrow channel?
A. One prolonged blast
B. Three short blasts
C. Four short blasts
D. Five short blasts
SOUND &
LIGHT SIGNALS
7. What signal does a vessel give when nearing
a bend in a narrow channel?
A.One prolonged blast
B. Three short blasts
C. Four short blasts
D. Five short blasts
SOUND &
LIGHT SIGNALS
8. A vessel leaving a dock or berth, shall give
what signal on her whistle?
A. One prolonged blast
B. One short blast
C. four short blasts
D. Five short blasts
SOUND &
LIGHT SIGNALS
8. A vessel leaving a dock or berth, shall give
what signal on her whistle?
A.One prolonged blast
B. One short blast
C. four short blasts
D. Five short blasts
SOUND &
LIGHT SIGNALS
9. If a vessel does not understand the signal
from another vessel, she should answer with:
A. The same signal
B. Three short blasts
C. Four short blasts
D. Five or more short blasts
SOUND &
LIGHT SIGNALS
9. If a vessel does not understand the signal
from another vessel, she should answer with:
A. The same signal
B. Three short blasts
C. Four short blasts
D. Five or more short blasts
SOUND &
LIGHT SIGNALS
10. A power driven vessel making way in restricted
visibility sounds:
A. One prolonged blast at least once every 2 minutes
B. Three short blasts at least once every 2 minutes
C. The danger signal at least once every two minutes
D. One prolonged blast at least once every minute
SOUND &
LIGHT SIGNALS
10. A power driven vessel making way in restricted
visibility sounds:
A. One prolonged blast at least once every 2
minutes
B. Three short blasts at least once every 2 minutes
C. The danger signal at least once every two minutes
D. One prolonged blast at least once every minute
SOUND &
LIGHT SIGNALS
11.If in restricted visibility you hear 1 prolonged
and 2 short blasts followed by 1 prolonged and 3
short blasts you are hearing the signal of:
A. A sailboat under way, making way
B. A vessel restricted in its maneuverability
C. A vessel towing and the tow
D. A vessel not under command
SOUND &
LIGHT SIGNALS
11.If in restricted visibility you hear 1 prolonged
and 2 short blasts followed by 1 prolonged and 3
short blasts you are hearing the signal of:
A. A sailboat under way, making way
B. A vessel restricted in its maneuverability
C. A vessel towing and the tow
D. A vessel not under command
SOUND &
LIGHT SIGNALS
12.One prolonged and two short is a whistle
signal used at least once every 2 minutes by:
A. A vessel towing
B. A sailboat operating under sail power
C. A vessel restricted in ability to maneuver
or not under command
D. All of the above
SOUND &
LIGHT SIGNALS
12.One prolonged and two short is a whistle
signal used at least once every 2 minutes by:
A. A vessel towing
B. A sailboat operating under sail power
C. A vessel restricted in ability to maneuver
or not under command
D. All of the above
SOUND &
LIGHT SIGNALS
13.A vessel over 12 meters in length, at anchor
must sound what sound signal at least every
minute:
A. A rapid ringing of a bell for 5 seconds
B. A sounding of a gong for 5 seconds
C. A rapid ringing of a bell and five short whistle
blasts
D. None of the above
SOUND &
LIGHT SIGNALS
13.A vessel over12 meters in length, at anchor must
sound what sound signal at least every minute:
A. A rapid ringing of a bell for 5 seconds
B. A sounding of a gong for 5 seconds
C. A rapid ringing of a bell and five short whistle
blasts
D. None of the above
SOUND &
LIGHT SIGNALS
14.What whistle signal may be used to augment
the anchor signal:
A. five short
B. Four short
C. A short, a prolonged and a short
D. One prolonged and two short
SOUND &
LIGHT SIGNALS
14.What whistle signal may be used to augment
the anchor signal:
A. five short
B. Four short
C.A short, a prolonged and a short
D. One prolonged and two short
SOUND &
LIGHT SIGNALS
15.A vessel engaged in pilotage duty in
restricted visibility sounds:
A. Three short
B. Four short
C. One prolonged and three short
D. Five short
SOUND &
LIGHT SIGNALS
15.A vessel engaged in pilotage duty in
restricted visibility sounds:
A. Three short
B.Four short
C. One prolonged and three short
D. Five short
SOUND &
LIGHT SIGNALS
• 16. A high intensity white light flashing at a
regular interval 50 to 70 times per minute
indicates:
A. A tow by an vessel not equipped to tow.
B. A distress signal on International waters only.
C. A distress signal on the Inland Waters only.
D. A distress signal on International and Inland
Waters.
SOUND &
LIGHT SIGNALS
16.A high intensity white light flashing at a regular
interval 50 to 70 times per minute indicates:
A. A tow by an vessel not equipped to tow.
B. A distress signal on International waters only.
C. A distress signal on the Inland Waters
only.
D. A distress signal on International and Inland
Waters.
SOUND &
LIGHT SIGNALS
17. What sound signal must a vessel under 12 meters
make if anchored in restricted visibility?
A. The rapid ringing of a bell for 5” at least once every
minute.
B. Any sound signal that can not be confuse with
another sound signal.
C. The rapid ringing of a bell at least once every 2
minutes.
D. Five or more short blasts at least once every
minute.
SOUND &
LIGHT SIGNALS
17. What sound signal must a vessel under 12 meters
make if anchored in restricted visibility?
A. The rapid ringing of a bell for 5” at least once every
minute.
B. Any sound signal that can not be confused
with another sound signal.
C. The rapid ringing of a bell at least once every 2
minutes.
D. Five or more short blasts at least once every
minute.
SOUND &
LIGHT SIGNALS
18.If in restricted visibility you hear a whistle
signal consisting of 1 short, 1 prolonged and
1 short blast, you are hearing:
A. A vessel drifting.
B. A vessel making way under power.
C. A vessel in distress.
D. A vessel at anchor.
SOUND &
LIGHT SIGNALS
18.If in restricted visibility you hear a whistle
signal consisting of 1 short, 1 prolonged and
1 short blast, you are hearing:
A. A vessel drifting.
B. A vessel making way under power.
C. A vessel in distress.
D. A vessel at anchor.
SOUND &
LIGHT SIGNALS
19.If in restricted visibility, you hear a rapid
ringing of a bell followed by three distinct
strokes of the bell, you are hearing:
A. A vessel over 100 meters at anchor.
B. A vessel over 12 meters at anchor.
C. A vessel aground.
D. None of the above.
SOUND &
LIGHT SIGNALS
19.If in restricted visibility, you hear a rapid
ringing of a bell followed by three distinct
strokes of the bell, you are hearing:
A. A vessel over 100 meters at anchor.
B. A vessel over 12 meters at anchor.
C.A vessel aground.
D. None of the above.
SOUND &
LIGHT SIGNALS
20. Which of the following frequency ranges is
correct for a vessel’s signal whistle:
A. 250-525HZ for vessels less than 75 meters.
B. 70- 250 Hz for vessels over 75 meters.
C. None of the above.
D. All of the above.
SOUND &
LIGHT SIGNALS
20.Which of the following frequency ranges is
correct for a vessel’s signal whistle:
A. 250-525 Hz for vessels less than 75
meters.
B. 70- 250 Hz for vessels over 75 meters.
C. None of the above.
D. All of the above.