Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 104
nd by computation usinglogarithms or by inspection from the traverse tables.The latter method offers greater advantage as itis more convenient. The tables are based upon thefollowing formula: Diff. of Longitude = Dist. Cos. Course (Dist. Cos. C.) Distance = difference of latitude Sec. C (D. Lat.… … 69 UTTMARKS GUIDE The tables then become very convenient formaking the required conversions. Short rule for finding difference of longitudewhen the departure is given. Enter Table II with the latitude as a course, selectthe amount of departure from a latitude column, find thedifference of longitude…
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