What must you display when anchoring at night?

When anchoring at night, displaying an all-around white light is essential for safety and compliance with navigation rules. This type of light provides visibility to other vessels, indicating that your boat is anchored and not under way. The all-around white light must be visible from all directions, ensuring that approaching vessels can see your boat and avoid a potential collision.

Using an all-around red light, which is typically used for specific signaling purposes, or a flashing beacon, intended for different circumstances, would not convey the proper information about your vessel's status when anchored. Similarly, a spotlight is primarily used to illuminate specific areas or objects and does not serve the purpose of indicating your position to others on the water.

In summary, displaying an all-around white light while anchored at night ensures you are following maritime safety laws and helps prevent accidents by making your anchored vessel visible to other boats operating in the area.