How is a RAM vessel visually indicated to other vessels?

• A. By special lights and day shapes defined by COLREGs for RAM.
• B. Flag signals only.
• C. Sound signals only.
• D. No visual indicators are required.

Answer: (A)

A RAM vessel signals its restricted ability to maneuver so other ships can understand how to pass safely. This is done with standardized visual cues defined in the COLREGS, shown both in daylight and at night.

In daylight, a RAM vessel displays a vertical arrangement of three shapes: a ball, a diamond, and a ball. This ball-diamond-ball pattern immediately communicates that the vessel’s movements are limited.

At night or in poor visibility, the RAM vessel shows a vertical line of three all-round lights: top red, middle white, bottom red. The red-white-red sequence conveys the same restriction to approaching vessels.

These specific indicators are designed to be universally recognized, so other mariners know to give RAM vessels extra space and avoid dangerous situations.