Figure 2-17. Typical
sound-producing devices
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32 Chapter One
Figure 2-16A. Rule 37 Distress Signals.
Use Restrictions
Regulations prohibit display of visual distress
signals on the water under any circumstances
except when assistance is
required to prevent immediate or potential
danger to persons onboard a boat.
Sound-Producing Devices
The Navigation Rules require you to use
sound signals during periods of limited visibility
and in meeting, crossing, and overtaking
situations. Figure 2-17 illustrates
typical devices that will produce sound.
The law states you must have some
means of making an efficient sound signal.
Air-powered horns are ideal for a small boat.
A vessel of 39.4 feet or more in length
shall be provided with a whistle, and a vessel
65.6 feet or more in length shall be provided
with a bell in addition to the whistle. A vessel
of less than 39.4 feet in length shall not
be obligated to carry the sound signaling
appliances for larger vessels, but if she does
not, she shall be provided with some other
means of making an efficient signal.
The majority of the recreational boaters
operate in vessels 16-26 feet in length.
For these vessels, an electric horn or compressed
air sound signaling appliance facilitates
signaling your position in reduced
visibility or maneuvering intentions in
compliance with the Navigation Rules.
Police-type whistles should be attached
to all life jackets may meet the signaling
requirement for paddle craft and small
boats. Use of a police-type whistle may
have limited range.
When a vessel is in distress
and requires assistance she
shall use or exhibit the signals
described in Annex IV
to the Navigation Rules and
Regulations Handbook.
The distress signals for
inland waters are the same
as those displayed in the
table (Right) with the following
additional signal:
Figure 2-16B. Rule 37—Inland
Only. A high-intensity white
light flashing at regular intervals
from 50 to 70 times per
minute.
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SIRIUS SOS Distress
Light, Electronic Flare.
The Weems and Plath
SOS Distress Light is an
electronic flare that meets
US Coast Guard requirements
(certified Visual
Distress Signal for night
use) as a qualified alternative
to traditional flares,
with no expiration date
or hazardous disposal to
worry about. The SOS
sequence flashes for up
to 60 hours on 3 C-cell
batteries. Combine it
with the Daytime Distress
Signal Flag and together
they meet ALL USCG
requirements for day and
night use. Visible up to 10
miles. Can be tested regularly
with simple twist of
the lens.
INMARSAT DIGITAL
SELECTIVE
CALLING