Detailed channelling and operating rules for maritime frequencies: general provisions per band (for example, 518 kHz reserved for NAVTEX and 490 kHz and 500 kHz for maritime safety information broadcasts by coast stations; HF maritime bands subdivided per Appendix 17), narrow-band direct printing, digital selective calling (mode of operation, call and acknowledgement, watch, per band), the automatic connection system, wide-band telegraphy and facsimile, radiotelephony (call and reply, traffic, regional provisions) and data transmissions.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.