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Thursday, November 19th, we got under weigh, and left Gage's Roads, passing between Rottenest and the Main. At noon our observed latitude was 32° 00' 50", at which time we were a full mile to the northward of the reef off the western point of Rottenest, situated West 16° north of Arthur's head, distant about twelve English miles, by which bearing it would be in 32° 2' 13", so nearly coinciding with the latitude by observation, and agreeing with that assigned long ago by Vlaming, that it may be considered pretty correct.