blasts) if intent is not clear. A short blast is one or two
seconds long. A long blast is 4 to 6 seconds long. The
Navigational Aids Chart at the end of this section lists
the meanings of the various whistle signals.
buoys have a cone shaped top with their points
cut off. Do not pass too close to a buoy. You may
foul the propeller in its chain.
Buoys are anchored ﬂoating objects and may
not always be in exactly the same position.
C - 2 NAVIGATIONAL AIDS
Aids to navigation (ATONS) help you to travel safely on
the water. They help you get from one place to another
and are most helpful if you have a nautical chart. A
navigational aids chart is at the end of this section.
Daymarks are red or green boards with numbers.
They are on posts or groups of pilings tied together
and called dolphins. Daymarks and their supports
are daybeacons. Daybeacons may or may not have
lights. If a red or green daybeacon has a light, it is
the same color as the marker-red or green. Red
daymarks are triangular and have even numbers.
Green daymarks are square and have odd numbers.
NEVER tie your vessel to an ATON. It is illegal
because it blocks the ATON from view of other
boaters. Decreased visiblility can contribute to
a serious accident which may result in property
damage, personal injury, or death.
Red Right Returning is a basic rule to assist you in
using lateral markers. When you are returning from
seaward, keep red markers on the starboard (right)
side when you pass them. Keep green markers to
the port side.
There are two ATON systems. The system used on
federal waters is known as the International Associa-
tion of Lighthouse Authorities System B (IALA-B).
The Coast Guard maintains this system. The second
system is the Uniform State Waterway Marking System
(USWMS). This system is maintained by state
Returning from seaward is very clear if you have
been on the ocean. You are returning to port. By
agreement, going upstream on a navigational river is
returning from seaward. The outlet ends of the Great
Lakes are also the seaward ends. Traveling from a
large body of water to a smaller one is considered
returning from seaward.
A. International Association of Lighthouse
Authorities System B (IALA-B)
C. Safe Water Markers
IALA-B uses four types of ATONS. This section
discusses the two most common markers: lateral
markers and safe water markers. Other federal
markers include special markers and isolated danger
markers. The Navigational Aids Chart at the end
of this section shows these aids.
Safe water markers have vertical red and white
stripes and mark the center of navigable channels
and fairways. Safe water markers included both
lighted and unlighted buoys and daymarks. If a
marker is lighted, the light is white and ﬂashes the
letter “A” is Morse Code.
B. Lateral Markers
Preferred Channel markers have horizontal red and
green bands. If lighted, the color of the light is the
same as the top of the band. They show the pre-
ferred channel for you to use at a junction point. Be
sure to notice the color of the top of the band, and
treat it as any other marker you would of that color.
If the band is red and you are returning from sea-
ward, keep the marker to the right.
Marker colors only apply in North America.
Lateral markers indicate the sides of navigable
channels. They consist of lighted can or nun buoys
and daymarks. Each has a number and is either red
or green. The numbers on the green markers are odd.
Red markers have even numbers.
Most lights on markers ﬂash on and off. Others such
as lights on aids with no lateral signiﬁcance are ﬁxed.
They stay on all night. ATON lights ﬂash in regular
patterns. For example, they may ﬂash every three
Buoys are red or green ﬂoating ATONS. If lighted, they
have either red or green lights. Unlighted green buoys,
called cans, look like cylinders. Unlighted red nun
Basic Seamanship - Section C
Owner’s Manual Page 40
|Categories||Four Winns F-Series Manuals, Four Winns Manuals|
|Tags||Four Winns F|
|Document Type||Owner's Manual|
|Product Brand||Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx|
|Document File Type|
|Wikipedia's Page||Outboard Marine Corporation|
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