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Admit a Ship sail N. W. by W. untill her* 1.1 difference of Latitude be 309 3/10 Minutes, I de∣mand her distance sailed, and her departure from the Meridian?
1. To find the distance, say,
As Sc. of V. of the Course A 56° 15',
To Log. cr. AB the X. of Lat. 309 3/10 Minutes.
So is the Radius or S. 90°,
To Log. AC 372 the distance sailed.
2. For the Departure, say,* 1.2
As Sc. of A V. of the Course 56° 15",
To Log. cr. AB. X of Lat. 309 3/10 Minutes.
So is S. of V. of the Course A 33° 45',
To Log. cr. AB 206 6/10 Minutes, the Departure required.
By the help of this Proposition, when your Latitude by Observation doth not agree with your dead reckoning, (kept by the former Proposition) Then according to this Rule, you may make your way saild agree with your Observed Latitude, and so correct your Ac∣count or dead Reckoning.
Fig. 44.
Fig. 44.