Derived from File:Color etopo1 ice low.jpg, routes sourced by Rod Heikell, Andy O’Grady: Blauwasserrouten: Törnplanung - Wetterrouting - Landfall; Edition Maritim; Hamburg 2014; ISBN 978-3-89225-711-0; Originalausgabe unter dem Titel Ocean Passages & Landfalls, Cruising routes of the world bei Imray.

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