Crown Copyright reservedAdmiralty , hydrografic Department of theOberkommando der KriegsmarineKongelige Sekart ArkivDeutsches Hychrographisches InstitutMinisterie van Marine , Afdeling HygrografieKungl. SjokarteverketNavyWilson , CharlesImray and Son , JamesHydrografic Dept MOD (N)Topografische InrichtingRoyal Danish Hydrographic Office