From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_493_Approaches_... Uploaded by Brian Tiplady. Last modified over 3 years ago. 7 control points.
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File:Admiralty Chart No 493 Approaches to Trinidad, Published 1965.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_493_Approaches_... Uploaded by Brian Tiplady. Last modified over 3 years ago. 7 control points. Links: Wikimedia Commons
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