24NM 1:350 000 12 NM 1:180 000 6 NM 1:90 000 3 NM 1:45 000 1.5 NM 1:22 000 0.75NM 1:12 000 0.5 NM 1:8 000 0.25 NM 1:4 000 table: Radar range / standard scale How are official ENCs named? Each official ENC is identified by an 8 character identifier e.g. FR 501050. The first two characters indicate the producer e.g FR for France, GB for Great Britain (a complete list of producer codes is included in the IHO standard S-62). The third character (a number from 1 to 6) indicates the navigational purpose band (as shown in the table above). The last 5 characters are alpha- numeric and provide a unique identifier. Updating ENCs In principle the generation and distribution of regular updates uses identical
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