RYA Handy Guide to CEVNI. RYA Code G106. 2016 Edition. If you are going cruising on the inland waterways of Europ then it is essential that you understand what you may see and hear while there. This new book is designed to provide a quick reference guide to the lights, shapes, sounds and signs you may encounter. It also gives useful information on how CEVNI (Code Europeen des Vois de Navagation Interieure) is a category of the International Certificate of Competence (ICC)., why you should take the CEVNI test and how you can do it and where the CEVNI rules apply. 210 a 148 x 4mm. 48 pages. Full colour. Paperback.