Boxell's Chandlery
A Division of C.G. Edwards

12 "B" St., P.O. Box 358
Boston, MA 02127
Phone: (617)-241-2800 * Fax:(617) 268-8845
Email: boxells@cgedwards.com


Come visit us at the corner of Dorchester Ave. and B St., South Boston MA

National Geospatial-Intelligence Agency
International Charts

Please click on your Area of Interest

Dma Nautical Charts Index DMA Region 1 DMA Region 2 DMA Region 3 DMA Region 4 DMA Region 4 DMA Region 5 9 DMA Region 6 DMA Region 6 DMA Region 7 DMA Region 8 DMA Region 9

 

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Chart Scales

The scale of a chart refers to a measurement of distance. A chart covering a relatively large area is called a Small Scale chart and one covering a relatively small area is called a Large Scale chart.

Scale may vary from 1:1,200 for harbor plans to 1:20,000,000 for world charts. Most nautical charts contain a reference to a natural scale, expressed as a ratio; e.g. 1:25,000 indicating that one unit of the chart represents 25,000 units of the earths surface.

Another way of expressing scale, called numerical scale, is in inches equivelant to the nautical mile. To calculate an inch to a nautical mile, divide the scale into 72,913,24

At Scale 1: Inches to 1 Natical Mile At Scale 1: Inches to 1 Natical Mile At Scale 1: Inches to 1 Natical Mile
 
1,200 60.76 24,000 3.04 150,000 0.49
2,400 30,38 25,000 2,92 200,000 0.36
4,800 15.19 30,000 2.43 250,000 0.29
5,000 14.58 35,000 2.08 300,000 0.24
10,000 7.29 40,000 1.82 400,000 0.18
11,000 6.63 50,000 1.46 500,000 0.15
12,000 6.08 55,000 1.33 1,000,000 0.07
12,500 5.83 60,000 1.22 1,200,000 0.06
15,000 4.86 72,000 1.01 2,000,000 0.04
17,000 4.29 75,000 0.97 3,000,000 0.02
20,000 3.65 80,000 0.91 5,000,000 0.01
22,000 3.31 100,000 0.73  

Contact C.G. Edwards
Contact C.G. Edwards

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Please Note:
With all the recent cases of on-line credit card and Identity theft,
we feel obliged to inform our customers that neither
C.G. Edwards Co Inc. or Boxell's Chandlery,
under any circumstance sell or divulge any personal information about our customers,
nor do we in any way store confidential information on our server.
Please be assured that we will continue to do everything within our power to keep any
information submitted by our customers as secure as we possibly can.

This site last updated February 7, 2012

All Images and logo's on this website are copyrighted and may not be reproduced without permission

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