The 2015 Imray Chart Y17 is a navigational chart focusing on the Rivers Colne, Blackwater, Crouch, and Roach. Produced by Imray in the United Kingdom, this chart is in English and features a map scale of 1:50,000. Ideal for those interested in navigation, this chart provides detailed information for navigating these specific rivers in the United Kingdom. Imray charts are known for their accuracy and reliability, making this publication a valuable resource for mariners and waterway enthusiasts alike.