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The ENC is composed by some size's file which is enclosed by latitude and longitude.
This file is called Cell.
And, the Cell has different size on navigational purpose and on using paper charts.
The S-57,E3.1 has 6 different Cells which are from 1st level to 6th level.
Each country can decide size of Cell on making ENC from some scale's paper charts freely.
We are adopting Cell's table which is as follows.
NP | Navigational purpose | Boundary of chart's scale | Size of Cell | Number of cells |
---|---|---|---|---|
1 | Overview | 1:1,500,000 > | Over 8 degrees | 30 |
2 | General navigation | 1:300,000 to 1:1,500,000 | 4 degrees | 38 |
3 | Coastal navigation | 1:80,000 to 1:300,000 | 1 degree | 154 |
4 | Approach | 1:25,000 to 1:80,000 | 30 minutes | 174 |
5 | Harbour | 1:7,500 to 1:25,000 | 15 minutes | 345 |
6 | Berthing | > 1:7,500 | 15 minutes | 0 |
Total | 791 |
Year | No. | Date of issue | Cells | No. | Date of issue | Cells | No. | Date of issue | Cells | No. | Date of issue | Cells |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2011 | 83 | 2011/01/28 | 249 | 84 | 2011/02/25 | 249 | 85 | 2011/03/25 | 234 | 86 | 2011/04/29 | 332 |
87 | 2011/05/27 | 178 | 88 | 2011/06/24 | 222 | 89 | 2011/07/29 | 220 | 90 | 2011/08/26 | 163 | |
91 | 2011/09/30 | 142 | 92 | 2011/10/28 | 125 | 93 | 2011/11/25 | 108 | 94 | 2011/12/23 | 163 | |
2010 | 71 | 2010/01/29 | 127 | 72 | 2010/02/26 | 141 | 73 | 2010/03/26 | 249 | 74 | 2010/04/30 | 219 |
75 | 2010/05/28 | 204 | 76 | 2010/06/25 | 142 | 77 | 2010/07/30 | 159 | 78 | 2010/08/27 | 126 | |
79 | 2010/09/24 | 155 | 80 | 2010/10/29 | 213 | 81 | 2010/11/26 | 209 | 82 | 2010/12/24 | 307 |
If you want to buy ENCs, please contact to Japan Hydrographic Association (JHA).