MapMedia C-Map Wide Vector Chart: WVJRSM220MAP - Russia - Moskow Channel and Oka River (Update) South China and Eastern Archipelagic Seas 0 Responsibility for Loss or

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MapMedia C-Map Wide Vector Chart: WVJRSM220MAP - Russia - Moskow Channel and Oka River (Update) South China and Eastern Archipelagic Seas 0 Responsibility for Loss orHow MapMedia electronic charts are updated To meet the needs and safety of users, MapMedia updates its vector charts once or twice a year, according to the chart providers' updates, and once a year for raster charts. It is of course, extremely important for boaters to keep their charts up to date, in order to ensure the safety of all passengers onboard. Corrections, improvements and changes are made on a daily basis by the Hydrographic Services and by