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American Practical Navigator by N. Bowditch PDF

By N. Bowditch

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Traditional nautical charts have been printed on paper. Electronic charts consisting of a digital data base and a display system are in use and will eventually replace paper charts for operational use. An electronic chart is not simply a digital version of a paper chart; it introduces a new navigation methodology with capabilities and limitations very different from paper charts. The electronic chart will eventually become the legal equivalent of the paper chart when approved by the International Maritime Organization and the various governmental agencies which regulate navigation.

Local authorities should be consulted for the controlling depth. NOS Charts frequently show controlling depths in a table, which is kept current by the Notice to Mariners. The chart scale is generally too small to permit all soundings to be shown. In the selection of soundings, least depths are shown first. This conservative sounding pattern provides safety and ensures an uncluttered chart appearance. Steep changes in depth may be indicated by more dense soundings in the area. The limits of shoal water indicated on the chart may be in error, and nearby areas of undetected shallow water may not be included on the chart.

Only a small fraction of the 36 NAUTICAL CHARTS Figure 326a. Part of a “boat sheet,” showing the soundings obtained in a survey. Figure 326b. Part of a nautical chart made from the boat sheet of Figure 326a. Compare the number of soundings in the two figures. NAUTICAL CHARTS soundings taken in a thorough survey are shown on the chart, but sparse or unevenly distributed soundings indicate that the survey was probably not made in detail. See Figure 326a and Figure 326b Large blank areas or absence of depth contours generally indicate lack of soundings in the area.

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American Practical Navigator by N. Bowditch

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