|Symbol||Description||OSM Tags||OSM Proposals|
A: Chart Number, Title, Marginal Notes
1: Chart number in National Chart Series
2: Chart number in international chart series (INT if any)
3: Cautionary note (if any) on WGS84 datum
4: Publication Note (imprint)
5: Copyright note
6: Edition note.
7: Small correction note
8: Dimensions of inner borders
9: Corner co-ordinates
10: Chart title
11: Explanatory notes on chart construction. To be read before using chart
12: Seals of issuer (national chart agency) and International Hydrographic Organization (IHO) to show that chart is an international one. Purely national charts mighthave only national seal. Reprints of charts from other national series must also hold seal of origin (third seal)
13: Scale of chart at stated latitude. The scale is precisely as stated only at the latitude quoted
14: Linear scale on large-scale charts
15: Linear border scale on large scale coastal charts. On smaller scales use latitude borders for sea miles.
16: Cautionary notes (if any). Information on particular features. to be read before using chart
17: Source Diagram (if any). The source diagram should be studied before using the chart in order to assess the reliability of the sources. Navigators should be cautious where surveys are inadequate.
18: Reference to a larger scale chart
19: References to an adjoining chart of similar scale
20: Instruction to refer to complimentary nautical publications
Note: a and b are references used only in some national series. In the example (french) a refers to the French Notices to Mariners weekly, and b to identificator of a latticed chart.