Every ship radiotelephone station, ship earth station and GMDSS ship station is controlled by an operator holding a certificate issued or recognized by the flag government (47.2), with national discretion only for stations solely above 30 MHz not on international frequencies (47.4, 47.5); administrations prevent fraudulent use of certificates, which carry photograph and date of birth for maritime certificates issued since 1978 and required particulars, and bind operators to secrecy (47.9 to 47.17); the certificate categories (radio electronic first and second class, general operator, restricted operator, long-range and short-range) and their conditions are set by Table 47-1 and Resolution 343 (47.19 to 47.27D).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.