By N. Bowditch

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Extra resources for American Practical Navigator

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Minimizing Errors Caused By Differing Datums To minimize problems caused by differing datums: • Plot chart corrections only on the specific charts and editions for which they are intended. Each chart correction is specific to only one edition of a chart. When the same correction is made on two charts based on different datums, the positions for the same feature may differ slightly. This difference is equal to the datum shift between the two datums for that area. • Try to determine the source and datum of positions of temporary features, such as drill rigs.

Any notices which accumulate between the chart date and the announcement date in the Notice to Mariners will be given with the announcement. Comparing the dates of the first and current editions gives an indication of how often thechart is updated. Charts of busy areas are updated more frequently than those of less traveled areas. This interval may vary from 6 months to more than ten years for NOS charts. This update interval may be much longer for certain DMAHTC charts in remote areas. New editions of charts are both demand and source driven.

Except on Intracoastal Waterway charts and charts of state waterways, the abbreviation “Bn” is shown beside the symbol, along with the appropriate abbreviation for color if known. For black beacons the triangle is solid black and there is no color abbreviation. All beacon abbreviations are in vertical lettering. Radiobeacons are indicated on the chart by a purple circle accompanied by the appropriate abbreviation indicating an ordinary radiobeacon (R Bn) or a radar beacon (Ramark or Racon, for example).

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American Practical Navigator by N. Bowditch
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