Question 34 GLI08 - Limited OUPV

The Correct Answer is C. **Explanation for Option C (flashing blue light):** Within the "INLAND ONLY" rules (specifically referencing U.S. Inland Navigation Rules, 33 CFR Subchapter E), a flashing blue light is a specific signal authorized for use by **law enforcement vessels** when actively engaged in law enforcement duties. Rule 22(b) concerning visibility of lights states that a flashing blue light, if used by a patrol vessel, must be located so that it does not interfere with the proper visibility of the vessel's navigation lights. This light serves to identify the vessel as a law enforcement authority. **Explanation of Incorrect Options:** * **A) flashing red light:** A flashing red light is typically used to indicate danger or specific hazards, or sometimes in connection with search and rescue operations, but it is not the standard identifying light for law enforcement vessels under Inland Rules. Furthermore, steady or sequential red lights are core parts of standard navigation lights (port side, masthead, stern). * **B) flashing amber light:** A flashing amber (or yellow) light is often associated with towing operations (when the towing vessel exceeds a certain length) or dredges, to signify the nature of the operation or limited maneuverability. It is not designated for law enforcement identification. * **D) blue flag:** Flags are generally used for signaling (such as the Alpha flag for divers or various international code flags) or national/organizational identification. There is no provision in the Inland Rules for a blue flag to serve as the required display for an active law enforcement boat. The identification is required to be a specific light signal.