Question 2 GLI05 - Master or Mate of LT 200 GRT

The Correct Answer is A **Explanation for Option A (flashing blue light):** In inland waters, a law enforcement boat enforcing state or federal law is authorized to display an alternately flashing blue light. This light signals the vessel's status as an official law enforcement patrol and is used to signal other vessels to stop, often in conjunction with a siren or horn. This regulation is mandated under the Inland Navigation Rules (33 CFR Part 89.21), which specifies the authorized lights and shapes for various special-purpose vessels. **Why Option B (flashing amber light) is incorrect:** A flashing amber (or yellow) light is typically reserved for purposes such as dredges, vessels engaged in restricted ability to maneuver (like certain towing operations), or non-military patrol craft operating on the Mississippi River system (under specific conditions). It is not the designated signal for a general law enforcement vessel in inland waters. **Why Option C (blue flag) is incorrect:** A flag is a day signal, but there is no recognized navigation rule that requires or authorizes a law enforcement vessel to display a blue flag specifically for the purpose of signaling its status or demanding a stop. Official status is signaled primarily by lights (at night) or specific flags/shapes related to operational status (e.g., diver down flag), but not a standard blue flag for law enforcement identification. **Why Option D (flashing red light) is incorrect:** A flashing red light is typically used in emergency situations by certain emergency vessels (like fireboats or ambulance boats) or as part of navigation aids (buoys/markers). It is not the standard distinguishing light authorized for identifying an inland law enforcement vessel demanding compliance.