Quantcast Chart Scale - 14220_32

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Nautical Chart Interpretation, Continued - 14220_31
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Chart Accuracy - 14220_33
Chart Scale Information The  scale  of  a  chart  refers  to  a  measurement  of  area,  not  distance. A chart  covering  a  relatively  large  area  is  called  a  small-scale  chart  and  a chart  covering  a  relatively  small  area  is  called  a  large-scale  chart.  Scales may  vary  from  1:  1,200  for  plans  to  1:  14,000,000  for  world  charts. Normally,  the  major  types  of  charts  fall  within  the  following  scales: Chart  Type Harbor  and Approach From To 1:1,000 1:50,000. Remarks Used  in  harbors,  anchorage  areas, and  the  smaller  waterways. Charts  used  for  approaching  more confined  waters  are  called approach  charts. coast 1:50,000 1:150,000. Used for inshore navigation, for entering bays and harbors of considerable  width,  and  for navigating  large  inland  waterways. General  and Sailing 1:150,000 1:6,000,000 Used  for  coastal  navigation outside  outlying  reefs  and  shoals when  the  vessel  is  generally  within sight  of  land  or  aids  to  navigation and  its  course  can  be  directed  by piloting  techniques. Understanding The  size  of  the  area  portrayed  by  a  chart  varies  extensively  according  to Chart Scales the  scale  of  the  chart.  The  larger  the  scale,  the  smaller  the  area represented. It  follows  then  that  large-scale  charts  show  areas  in  greater detail.  Many  features  that  appear  on  a  large-scale  chart  do  not,  in  fact, show up at all on a small-scale chart of the same area. The scale to which a chart is drawn usually appears under its title in one of  two  ways:  1:25,000  or  1/25,000.  These  figures  mean  that  an  actual feature  is  25,000  times  larger  than  its  representation  on  the  chart. Expressed  another  way,  an  inch,  foot,  yard,  or  any  unit  on  the  chart means  25,000  inches,  feet,  or  yards  on  Earth’s  surface. The  larger  the  figure  indicating  the  proportion  of  the  scale,  the smaller  the  scale  of  the  chart.  A  chart  with  a  scale  of  1:25,000  is  on  a much  larger  scale,  for  instance,  than  one  whose  scale  is  1:4,500,000. 1-16

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