By N. Bowditch
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Extra info for American Practical Navigator
If it is in a sparsely-traveled area, other priorities may delay a new edition for several years. Conversely, a new edition may be printed without the receipt of significant new data if demand for the chart is high and stock levels are low. Notice to Mariners corrections are always included on new editions. DMAHTC charts have the same two dates as the NOS charts; the current chart edition number and date is given in the lower left corner. Certain DMAHTC charts are reproductions of foreign charts produced under joint agreements with a number of other countries.
Since these systems are used primarily by military forces, they are sometimes called military grids. CHART SCALES 324. Types Of Scales The scale of a chart is the ratio of a given distance on the chart to the actual distance which it represents on the earth. It may be expressed in various ways. The most common are: 1. A simple ratio or fraction, known as the representative fraction. For example, 1:80,000 or 1/80,000 means that one unit (such as a meter) on the chart represents 80,000 of the same unit on the surface of the earth.
If the chart is not carried far beyond the standard parallels, and if these are not a great distance apart, the distortion over the entire chart is small. A straight line on this projection so nearly approximates a great circle that the two are nearly identical. Radio beacon signals travel great circles; thus, they can be plotted on this projection without correction. This feature, gained without sacrificing conformality, has made this projection popular for aeronautical charts because aircraft make wide use of radio aids to navigation.