http://books.google.com/books?id=duzio8OkjPoC&lpg=PA191&dq=nautical%20science%20modern%20technologies&pg=PA210#v=onepage&q=nautical%20science%20modern%20technologies&f=false
About watchkeeping and technologies
http://books.google.com/books?id=pUkrAAAAYAAJ&lpg=PA434&dq=navigation%20technologies&pg=PA72#v=onepage&q=navigation%20technologies&f=false
Marine simulation and ship manoeuvrability: proceedings of the International ...
By M.S. Chisletthttp://books.google.com/books?id=o7TxZYRO_XMC&lpg=PP1&pg=PA387#v=onepage&q&f=false

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