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Published online by Cambridge University Press: 21 October 2009
The need for maritime navigation is obvious and the subject has a long history, indeed the science of navigation was mainly developed for maritime purposes. The areonautical requirement is nowhere near as old as the maritime, in the early days it was sufficient to follow roads or railways, the need for navigation came when crossing seas or not being able to see the ground for a large part of the journey. Space navigation requirements are even younger.