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Weems & Plath LIGHTrule CEVNI - European Inland Waterways
The LIGHTrule for Europe's rivers and canals, showing every light and signal under the CEVNI code.

Limited lifetime warranty from Weems & Plath on the movement, for as long as you own the instrument. View the warranty terms (PDF)
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Shipped insured and fully tracked directly from the manufacturer's warehouse in Denmark or England. Free delivery in the Netherlands from € 75.
14-day right of withdrawal under European law, with manufacturer warranty handled by us. Contact us first and we send you a return note.
European inland waterways have their own system of vessel lights, known as CEVNI. This version of the LIGHTrule makes it clear at a glance.
For rivers and canals
Over 50 light configurations and 18 manoeuvring and warning signals are shown, with actual views of vessels from every side and a guide to horn signals.
A built-in magnifier keeps it readable, whether at the helm or studying for a licence.
Key features
- CEVNI code
- 50+ light configurations
- 18 signals
- Magnifying lens
Specifications
| Feature | Detail |
|---|---|
| Brand | Weems & Plath |
| Type | Light identification slide rule (CEVNI) |
| Dimensions | 407 × 133 mm (16 × 5¼ in) |
| Content | 50+ light configurations, 18 signals, horn signals |
| Material | Plastic with magnifier |
| Warranty | Weems & Plath Limited Lifetime Warranty |
| Weems & Plath item number | 191 |
| EAN | 0721002004376 |
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Explore our navigation aids and parallel rules and plotters, or see the full range on our Weems & Plath brand page.
Founded in Annapolis in 1928 by navigator Captain Philip Van Horn Weems, Weems & Plath remains a byword for dependable instruments. Order with confidence from Shipsclocks.com.
Frequently asked questions
What is CEVNI?
The European code for inland waterway navigation.
- Material
- Plastic







