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By it here on Amazon:  Weems and Plath LightRule

The Weems and Plath LIGHTrule is an indispensable tool for anyone serious about boating, particularly those learning or refreshing their knowledge of navigation lights.  This compact, durable plastic card is a marvel of simplicity and effectiveness. Its slide rule and magnifying lens quickly decode the complex light patterns displayed by vessels at night, making the often-confusing world of COLREGS much more accessible.  I found it particularly helpful in practicing identifying different vessel types and their activities, from sailboats under sail to large commercial ships.

The LIGHTrule covers various scenarios, including vessel sizes, operating conditions (underway, at anchor, aground), and even sound signals used in restricted visibility.  Its compact size makes it easy to store on the boat or in a navigation bag, ensuring it's always readily available. While nothing replaces a thorough understanding of the rules, the LIGHTrule provides a quick and reliable visual aid, especially in challenging conditions or when you need a fast reminder.

The LIGHTrule is a valuable tool for any boater, especially those taking our Night Navigation course here at Sailing Knowledge.  While generally durable, it's best to avoid storing it in direct sunlight or on a boat's dashboard, as excessive heat can cause warping and render it unusable.  Proper care will ensure this handy tool remains a reliable aid for decoding vessel lights and understanding right-of-way rules.

The LightRule is an indispensable tool for the Night Time Lights and Navigation Course.

By it here on Amazon:  Weems and Plath LightRule