COLREGs Lights & Shapes Practice Test 2025 - Free Maritime Navigation Practice Questions and Guide

Question: 1 / 400

When is a diamond shape required to be displayed on a towing vessel?

When no other lights are displayed

When the length of the tow exceeds 100 meters

When the length of the tow exceeds 200 meters

A diamond shape is required to be displayed on a towing vessel when the length of the tow exceeds 200 meters. This regulation is in place to ensure that vessels navigating in the vicinity of towed vessels can adequately assess the potential hazards and the size of the tow. The display of a diamond indicates that the vessel is towing something large and potentially cumbersome, which requires greater caution from other vessels.

The positioning and visibility of the diamond shape are crucial in promoting safety on waterways, as vessels may be less maneuverable or require more time to stop when towing larger lengths. This is particularly important in busy shipping lanes or narrow passages where space and reaction time are limited. Hence, when a towing vessel is engaged in towing more than 200 meters in length, the diamond shape must be displayed to alert other mariners to the situation and promote safe navigation.

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When the towing vessel is over 50 meters

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