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LIGHTrules & ROADrules from Weems & Plath
Why do you need this gadget Today I heard the news that a yacht sank after trying to pass between a tug and its tow in New York harbor. This deadly accident could have been prevented had the yachts skipper known there was steel cable between the two vessels. This is not the first accident of this type
This featured product is a very handy navigation aid. Keep it in the chart table but also take it home and study it so you can quickly figure out how to use it but to also familiarize your self with basic navigation signals, markers shapes and lights. Quick Links link to Weems & Plath LIGHTrule & ROADrules LIGHTrule details ROADrule details How the WEEMSrules work Which is the correct rule for you
Mainly used at night the LIGHTrule does also have day shapes for vessels like tugs and tows. To read the day signals for a tug and tow look at the at the ends of the rule. If you have ever been on the water at night and wondered if the lights you see are from an approaching or fleeing vessel or if you wonder if the vessel is a fishing trawler or super tanker then LIGHTrule is for you
The red, green and white lights shown on the rule above are designed to be seen under a red night light LIGHTrule Colregs 190 features Identifies all USCG Colregs. Displays 60 light configurations. Displays 15 day shapes. Actual view of vessels for port, starboard, bow and stern lights. Visual guide for horn signals. Magnifying lens for clear readability of definitions. Durable plastic construction. Size: 16" x 5-1/4"
This rule is designed to help you understand day signals marker navigation buoys and many other objects you will encounter during a days boating
ROADrule USATONS 290 features Identifies the most common U.S. Aids to Navigation. Displays 38 Navigation Aid Definitions. Displays 12 Rules of the Road. Identifies bridge lighting and Intracoastal Waterway aids. Magnifying lens for clear readability of definitions. Durable plastic construction. Size: 16" x 5-1/4" (407 x 133 mm). Wt: 0.4 lb. (182 g).
How to use the LightRule and RoadRule The rules work like an old fashioned slide rule. You know those things before we had calculators and computers. I found it easy to separate the two parts of the rule and just read it. This helped me quickly understand what shapes and signals are where. The light are grouped together so it makes easier reading.Start by sliding the middle to align the slots with the actual lights you are seeing on the vessel that is approaching you. The example below shows the port side and bow views of an oncoming vessel.
Look at the above image of the light rule and you will see a vessels bow and port side diagram in the middle slider. In this there are slots where the lights would appear on the vessel.
This is the magnification bar for the above navigation light combination
The rule also lists the sound signals so if you are using this at night and in restricted visibility the rule will tell you what the sound signal means. Which Rule for you WEEMSrules are quick reference tools that identify either actual views of maritime bouyage systems with corresponding chart symbols or vessel light configurations at night. WEEMSrules come in 5 unique versions which cover all vessel lights and rules of the road throughout the world. To determine which WEEMSrules to use, refer to the world map below. 
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