From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_477_Trinidad_Ch... Uploaded by Kognos. Last modified about 4 years ago. 4 control points.
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File:Admiralty Chart No 477 Trinidad Channel Surveyed by Sir George Nares K.C.B., F.R.S. and J.P. MacLear . . . H.M.S. Alert 1879, Published 1881.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_477_Trinidad_Ch... Uploaded by Kognos. Last modified about 4 years ago. 4 control points. Links: Wikimedia Commons
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