Question 48

The Correct Answer is B **Explanation for Option B (a flashing blue light):** Under the Inland Navigation Rules, a **flashing blue light** is specifically designated for use by **law enforcement vessels only** when engaged in official duties. This is a unique signal that identifies the vessel as being involved in law enforcement activities and is not permitted for use by any other type of vessel (commercial, recreational, etc.) under normal operating circumstances. **Explanation for Incorrect Options:** * **A) an alternately flashing red and yellow light:** This signal is permitted for use by **rescue vessels or vessels involved in search and recovery operations** (SAR), not exclusively for law enforcement vessels. * **C) two red lights in a vertical line:** This signal indicates a vessel that is **not under command** (NUC). This light signal is standard and permitted for any vessel experiencing incapacitation, not just law enforcement vessels. * **D) a flashing yellow light:** This signal is permitted for use by a **WIG (Wing-In-Ground) craft** when taking off, landing, or flying near the surface, or sometimes used for certain types of dredging or navigation aids. It is not exclusively reserved for law enforcement.