Question 2 GLI06 - Master or Mate of LT 100 GRT

The Correct Answer is A **Explanation for Option A (flashing blue light):** A flashing blue light is the internationally recognized signal authorized for use by law enforcement, military, and sometimes emergency response vessels (like fireboats or medical aid vessels) when responding to or operating near an emergency, or when conducting official law enforcement duties. For US inland waters (as implied by the question restricting it to "INLAND ONLY," which often refers to US regulations), the display of a flashing blue light is specifically permitted for law enforcement vessels to identify themselves and signal a need for attention or right-of-way, usually associated with enforcing navigation laws. **Explanation for Option B (flashing amber light):** A flashing amber (or yellow) light is typically used in inland waters to indicate a dredge, a pipeline-laying operation, or a vessel engaged in highly restrictive work that limits its maneuverability but is not an immediate law enforcement function. It is not the standard identifying signal for a police or law enforcement boat. **Explanation for Option C (blue flag):** A blue flag (specifically the "Alpha" flag in international codes) is used to signal that a vessel has a diver down and is restricted in its ability to maneuver. While law enforcement vessels might have divers, the flag itself is an indication of diving operations, not the general identifying mark for a law enforcement boat. There is no regulation mandating or permitting a simple blue flag as the primary identification for a law enforcement vessel. **Explanation for Option D (flashing red light):** A flashing red light is typically reserved for highly specific signals, such as indicating a vessel that is constrained by draft, or, in some specific US contexts, certain types of official fixed aids to navigation. While rotating or flashing red lights are common for emergency vehicles on land, the standard identifying signal for law enforcement vessels on the water is the flashing blue light.