Thomas Porathe Doctoral Dissertation No. 27 3-D Nautical Charts and 3-D Nautical Charts and Safe Navigation Safe Navigation Thomas Porathe Department of Innovation, Design and Product Development Box 883, SE-721 23 Västerås/Eskilstuna, Sweden. 2006 Telephone +46 21-10 13 00, +46 16-15 36 00. e-mail:
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