The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Witherby Publishing Group Ltd:
Witherby Reader allows access to marine technical and regulatory publications for merchant shipping on the iPad.Witherbys publishes for marine industry bodies including: OCIMF, SIGTTO, CDI, SKULD, IACS & ITOPF and digitally publishes for: The IMO, INTERTANKO, ICS, Shipping Guides Ltd, Petrospot and Fathom Shipping.The eBook platform is recognised as electronically equivalent to the paper version for the carriage of eBooks on Merchant Vessels.The application does not contain eBooks. Use your customer licence code to download the eBooks that you own.