Eastern Caribbean General Chart 1:1,824,000. Imray-Iolaire charts are printed in color on durable waterproof paper. The Caribbean nautical charts use official surveys and notes based on local knowledge, to feature additional information on passages and anchorages as well as details of facilities for voyagers. Each of the Caribbean nautical charts has large scale inserts of the various important harbors and anchorages. This Imray-Iolaire passage chart for the Eastern Caribbean is printed in color on treated water-resistant paper.