UFC 4-150-06
12 December 2001
5-7.5
Daybeacons. Daybeacons shall be constructed and painted in order to
be distinct and conspicuous. Only white, green, or red color shall be used, either
separately or in combination. Where a number of daybeacons are to be used within a
limited area, use different types of construction to assist in distinguishing among them.
Daybeacons should be reflectorized for night use.
5-7.6
Fog Signals. Design fog signals at stations, where a continuous watch is
maintained, to be sounded both when the visibility decreases to 8.1 km (5 miles) and
when the fog whistle of a passing vessel is heard. Design fog signals at locations
where no watch is maintained to operate continuously or automatically. Fog signals on
buoys generally should be operated by the motion of the sea and should operate
continuously.
5-7.6.1
Sound Intervals. Time blasts for a minimum 2 seconds in length,
occurring at intervals not exceeding 60 seconds; preferable interval length is 15
seconds.
5-7.6.2
Suppliers. Fog signals built to USCG specifications may be purchased
from the USCG or from a manufacturer.
5-7.7
Ranges. Height, distance apart, size of daymark, and color marking are
dependent on local conditions, and general rules are not applicable. There are no rules
as to shape of the daymark, except that it be the most distinctive possible shape in the
range system.
5-7.8
Design of Support Structures. Design dolphins, towers, and similar
supports for lights, daybeacons, and similar aids in accordance with requirements for
the same or similar structures established elsewhere in this manual.
5-7.9
Moorings. Design moorings for buoys according to the requirements of
MIL-HDBK-1026/4
5-7.10
Buoy Systems. The U.S. and most Western-Hemisphere countries use a
buoy system based on green daymarks/black buoys for port hand and red
daymarks/red buoys for starboard hand when returning from sea. Many Eastern-
Hemisphere countries use green for starboard and red for port hand. The system that
is used in the local area is an important consideration when designing a new aid
system.
5-7.11
Environmental Monitoring and Operator Guidance System. As an
operational underkeel clearance (UKC) forecasting system, the Environmental
Monitoring and Operator Guidance System (EMOGS) was developed to provide safe
transit of deep draft vessels through shallow entrance channels. A risk-based system
used to avoid vessel grounding and to minimize channel depth requirements, EMOGS
can predict the estimated UKC during a specified transit through a shallow water
channel for the vessel in question. Silver et al.'s David Taylor Research Center (DTRC)
5-83
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