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Waterproof Paper: All Imray charts are printed on Pretex, a partially synthetic paper, which folds well and is durable in damp conditions. It may be drawn on in both soft pencil and ballpoint pen. Imray charts are normally published to an approximately A4 fold format and supplied in robust PVC wallets. Flat sheets are available on request.
Datums and Printing History: All Imary charts are now based on WGS 84 datum as indicated in the catalogue. Apart from some of the Imray-Iolaire charts of the Caribbean Sea, all are metric. Every chart includes details of the datum and projection on which it was based, to allow it to be used safely with satellite navigation systems.
Sheet Sizes: C charts: 787 x 1118mm (31" x 44") • Others: 640 x 900mm (25" x 35½") • 2000 series: A2 590 x 420mm
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