TITLE 33--NAVIGATION AND NAVIGABLE WATERS CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
PART 88_ANNEX V: PILOT RULES--Table of Contents
Sec. 88.11 Law enforcement vessels.
(a) Law enforcement vessels may display a flashing blue light when engaged in direct law enforcement or public safety activities. This light must be located so that it does not interfere with the visibility of the vessel's navigation lights.
(b) The blue light described in this section may be displayed by law enforcement vessels of the United States and the States and their political subdivisions.
Sec. 88.12 Public safety activities.
(a) Vessels engaged in government sanctioned public safety activities, and commercial vessels performing similar functions, may display an alternately flashing red and yellow light signal. This identification light signal must be located so that it does not interfere with the visibility of the vessel's navigation lights. The identification light signal may be used only as an identification signal and conveys no special privilege. Vessels using the identification light signal during public safety activities must abide by the Inland Navigation Rules, and must not presume that the light or the exigency gives them precedence or right of way.
(b) Public safety activities include but are not limited to patrolling marine parades, regattas, or special water celebrations; traffic control; salvage; firefighting; medical assistance; assisting disabled vessels; and search and rescue.
CHAPTER 34--INLAND NAVIGATIONAL RULES
SUBCHAPTER I--RULES Part C--Lights and Shapes Sec. 2021. Definitions (Rule 21)
(f) ``Flashing light'' means a light flashing at regular intervals at a frequency of 120 flashes or more per minute.
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