Nautical charts . FIG. 22. MERCATOR PROJECTION OF NORTH PACIFIC OCEAN, SHOWING GREATCIRCLE ROUTES YOKOHAMA TO PUGET SOUND, AND YOKOHAMA TO HONOLULUAND THENCE TO SAN FIG. 23. POLYCONIC PROJECTION OF PORTION OF NORTH PACIFIC OCEAN. C7n Poly conic Projection 73 straight lines on this projection is another defect, asby the plotting of bearings and angles on approachingthe land the positions of vessels are located on thechart; fortunately, however, the error due to this causeusually falls within the other uncertainties involved inlocating a ship; if need be it would be practicable toall
Nautical charts . FIG. 22. MERCATOR PROJECTION OF NORTH PACIFIC OCEAN, SHOWING GREATCIRCLE ROUTES YOKOHAMA TO PUGET SOUND, AND YOKOHAMA TO HONOLULUAND THENCE TO SAN FIG. 23. POLYCONIC PROJECTION OF PORTION OF NORTH PACIFIC OCEAN. C7n Poly conic Projection 73 straight lines on this projection is another defect, asby the plotting of bearings and angles on approachingthe land the positions of vessels are located on thechart; fortunately, however, the error due to this causeusually falls within the other uncertainties involved inlocating a ship; if need be it would be practicable toallow for this curvature. In the polar regions, how-ever, the faults of the mercator projection become somuch exaggerated that it is not used for navigationalpurposes, but because of the absence of commercialnavigation there this is a minor matter in the generalquestion of chart projection. For the plotting of origi-nal surveys the mercator projection is not suited and isnot used, for the reasons above mentioned. Tables of meridional parts are published whichgive the distance in terms of minutes of longitude fromthe equator to the various parallels; with these tablesa merc
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Keywords: ., bookcentury1900, bookdecade1900, bookp, booksubjectnauticalcharts
