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Inland
When power-driven vessels are in sight of one
another and meeting or crossing at a distance within half
a mile of each other, each vessel underway, when
maneuvering as authorized or required by the Inland
Rules, must indicate that maneuver by the following
signals on the whistle:
one short blast to mean I INTEND TO LEAVE YOU
ON MY PORT SIDE
two short blasts to mean I INTEND TO LEAVE
YOU ON MY STARBOARD SIDE
three short blasts to mean I AM OPERATING
ASTERN PROPULSION.
NOTE
The International Rules do not specify a
distance for sounding signals.
The International Rules read I AM, and the
Inland Rules read I INTEND TO.
The one- and two-short-blast signals in the Inland
Rules signify an intention of passage with one other
vessel.
Upon hearing the one- or two-blast signal of the
other, the vessel must, if in agreement, sound the same
whistle signal and take the steps necessary to effect a
safe passing. If, however, the vessel doubts the safety of
the proposed maneuver, the vessel must sound the
danger signal of at least five short, rapid blasts of the
whistle. Each vessel will then take appropriate
precautionary action until a safe passing agreement is
made.
A vessel may supplement those signals with light
signals.
Light signals must have the following significance:
one flash to mean I INTEND TO LEAVE YOU ON
MY PORT SIDE
two flashes to mean I INTEND TO LEAVE YOU
ON MY STARBOARD SIDE
three flashes to mean I AM OPERATING ASTERN
PROPULSION.
The duration of each flash must be about 1 second,
and the light used for this signal, if fitted, must be one
all-around white or yellow light visible at a minimum
range of 2 miles, synchronized with the whistle, and
must comply with the provisions of Annex I to the Inland
Rules.
NOTE
The Inland Rules do not specify an interval
between flashes or an interval between
successive signals.
The International Rules do not allow a
yellow light to be used for light signals.
The minimum visible range for light is 2
miles for Inland Rules and 5 miles for
International Rules.
The Inland Rules require that light signals
and sound signals be given at the same time
(synchronized).
When in sight of another, a power-driven vessel
intending to overtake another power-driven vessel must
indicate its intention by the following signals on the
whistle:
one short blast to mean I INTEND TO
OVERTAKE YOU ON YOUR STARBOARD SIDE;
and two short blasts to mean I INTEND TO
OVERTAKE YOU ON YOUR PORT SIDE.
NOTE
The Inland Rules require signals for
overtaking vessels when in sight of another
in a narrow channel or fairway.
The International Rules require two
prolonged blasts preceding the short blast
required by the Inland Rules.
In both International and Inland Rules,
overtaking signals are signals of intention
only and must be answered by the vessel that
is being overtaken.
The power-driven vessel about to be overtaken will,
if in agreement, sound a similar sound signal. If in doubt,
the vessel must sound the danger signal of at least five
short, rapid blasts.
NOTE
The Inland Rules require the vessel being
overtaken, if it agrees, to answer with a signal
similar to the one sounded by the overtaking
vessel. The International Rules require the
vessel being overtaken, if it agrees, to sound one
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