NS100

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NS100

• Fundamentals of
• Naval Science

Inland Rules of the Road V
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Objectives
1. Know the duration of whistle signals (Rule
32). 2. Be familiar with the devices required
for sound signals at sea (Rule 33). 3. Know
maneuvering and warning signals (Rule
34). 4. Know the sound signals used in
restricted visibility (Rule 35).
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Objectives
5. Be aware of requirements for signals to
attract attention (Rule 36).
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Definitions (Rule 32)
1. Whistle means any sound signaling appliance
capable of producing the prescribed blasts. 2.
The term short blast means a blast of 1 second in
duration. 3. The term prolonged blast means a
blast of 4-6 seconds duration.
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Equipment for Sound Signals (Rule 33)
1. Vessels are required to provide the following
signaling devices a. Less than 12m some means
of making an efficient signal. b. Greater than
12m and less than 100m A whistle and a bell.
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Equipment for Sound Signals (Rule 33)
1. Vessels are required to provide the following
signaling devices (contd) c. Vessels greater
than 100m must also provide a gong, the tone of
which cannot be confused with a bell.
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Maneuvering and Warning Signals (Rule 34)
1. Power driven vessels in sight of one another
and meeting or crossing at a distance within half
of a mile of each other (both underway), when
maneuvering, must use the following whistle
signals a. One short blast means, I intend to
leave you on my port side.
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Maneuvering and Warning Signals (Rule 34)
1.b. Two short blast means, I intend to leave
you on my starboard side. 1.c. Three short
blasts means, I am operating astern propulsion.
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Maneuvering and Warning Signals (Rule 34)
2. Upon hearing the one or two short blast signal
of another vessel, if in agreement, sound the
same signal and take steps necessary to ensure
safe passage. If not in agreement or unsure of
intentions, she shall sound five short blasts,
and each ship will make precautionary measures
until a safe passing agreement is reached.
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Maneuvering and Warning Signals (Rule 34)
3. Flashing light may be substituted for the
signals in numbers 1 and 2. The light must be
white or yellow, and have a range of at least two
miles.
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Maneuvering and Warning Signals (Rule 34)
4. In an overtaking situation, the power driven
vessel intending to overtake another power driven
vessel shall indicate her intentions by the
following whistle signals a. One short blast
means, I intend to overtake you on your
starboard. b. Two short blasts means, I intend
to overtake you on your port side.
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Maneuvering and Warning Signals (Rule 34)
4. In an overtaking situation, the vessel being
overtaken shall indicate her intentions by the
following whistle signals c. If in agreement,
the vessel shall sound a similar signal. If in
doubt, she shall sound the danger signal. d. When
in doubt, sound 5 short blasts.
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Maneuvering and Warning Signals (Rule 34)
5. A vessel nearing a bend or an area of a
channel or fairway where other vessels may be
obstructed, shall sound one prolonged blast. Any
vessel approaching shall repeat the signal. When
a power driven vessel is leaving a dock or berth,
she shall sound one prolonged blast.
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Maneuvering and Warning Signals (Rule 34)
6. If a vessel reaches agreement on
radio-telephone, signals are not required, but
optional. If no agreement is reached, whistle
signals shall be exchanged in a timely manner and
shall prevail.
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Signals in Restricted Visibility (Rule 35)
1. Power driven vessel underway One prolonged
blast NMT 2 minute interval. 2. Power driven
vessel underway but not making way Two prolonged
blasts with a 2 second gap NMT 2 minute
interval.
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Signals in Restricted Visibility (Rule 35)
3. The following vessels shall sound one
prolonged followed by two short blasts NMT 2
minute interval a. Not Under Command b.
Restricted in Ability to Maneuver (u/w or at
anchor) c. Sailing vessel d. Fishing vessel (u/w
or at anchor) e. towing or pushing
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Signals in Restricted Visibility (Rule 35)
4. The last vessel in a tow (if manned) One
prolonged followed by three short blasts every 2
minutes. This should be sounded immediately
after the tug that makes her signal.
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Signals in Restricted Visibility (Rule 35)
5. A vessel at anchor shall sound at intervals of
not more than one minute ring the bell rapidly
for about 5 seconds. a. If gt 100m, the bell sound
forward then a gong sounds aft for about 5
seconds. b. Optional signal one short/one
prolonged/one short to warn approaching vessels.
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Signals in Restricted Visibility (Rule 35)
6. A vessel aground shall sound the same signal
as a vessel at anchor, with three separate and
distinct strokes on the bell before and after the
rapid ringing of the bell. She may in addition
sound an appropriate whistle signal.
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Signals in Restricted Visibility (Rule 35)
7. A vessel lt12m is not obliged to give the above
signals, but must make some efficient sound
signal at intervals not to exceed 2 minutes. 8.
A pilot vessel when engaged in piloting duty may,
in addition to the signals prescribed earlier,
sound four short blasts.
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Signals to Attract Attention (Rule 36)
If necessary to attract the attention of
another vessel, any vessel may make light or
sound signals that cannot be mistaken for any
signal authorized elsewhere in these Rules, or
may direct the beam of her searchlight in the
direction of the danger, in such a way as not to
embarress any vessel.
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QUESTIONS?