References
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- 1988 . Astronomical Navigation Lisbon In 1370 Polaris would have been about 4½° distant from the Pole. There is some evidence that the oldest pilotage rules were based on this, but only corrupted fragments survive. L. de Albuquerque, (23–4. I have used existing diagrams based on the mid fifteenth-century distance of 3½°
- 1988 . Jour. of Inst. of Navigation , : 174 – 85 . Communication by W. McGrath to author, 20 October 1989, with reference to his trans-Indian Ocean voyage by such means. W. McGrath, ‘Some notes on the navigation of 1985 Trans-Indian Ocean canoe voyage’,41
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