Ships navigation- Supply, upkeep and readyness of charts and how to correct them
The Master shall keep and maintain the latest editions of Charts (of a large enough scale) & Nautical Publications for the areas which the merchant vessel routinely trades.
In addition he is to also keep selected Charts and nautical Publications taking into consideration the possibility of an emergency entry into such waters.
All corrections to charts and publications are available through a contractor who is authorized by various major hydrographic organizations. All corrections to active Charts (current portfolio) are also available via email and blocks correction to publications as well as full Notice to Mariners sent monthly by disc in mail packet.
Charts must also be corrected with any local Notices to Mariners issued by a port.
For ships fitted with ECDIS (Electronic Chart Display System), the Company (through a contractor) supplies disc containing updates of charts.
However, it is emphasized that the primary means of navigation is the paper chart and ECDIS is only an aid to navigation.
Correction Of Charts & Nautical Publications
A responsible officer should immediately correct the present voyage charts & publications upon receipt of the corrections, followed by other charts and publications.
Only current editions of Charts and Publications are to be used. Cancelled editions must be clearly marked so, in pen, and removed from the confines (territory) of the wheelhouse.
If there is a change in the route or the trading pattern, the previous charts must corrected until Master is sure that the vessel will not revert to that route in the foreseeable future.
Vessel using Digitrace should thoroughly familiarize / reading the instruction manual for correction of Charts and Nautical Publications .
Temporary (T) & Preliminary (P) notice numbers are to be recorded in Chart Correction Record . Such information is readily available in weekly notices to mariners or from the Digitrace system as well as from the monthly Digitrace update CDs (containing complete Notices to Mariners with corrections for all Charts & Publications).
Applicable T & P corrections shall then be made in Pencil on all charts to be used for the current voyage. After correcting affected voyage charts for applicable T & P corrections, the correction number shall be entered in Pencil at the location of correction as well as on the bottom of chart.
After making such correction, suitable annotation shall be made in the Chart Correction Record to indicate that the correction has been physically made on the chart. Any cancelled T & P notices should be struck out in the Chart Correction Record and erased from the corresponding charts.
A copy of the current In-Force list (usually published monthly) shall be filed along with the Chart Correction Record and used for monitoring and verification of current T & P notices in force.
Navigational Warnings promulgated through Notices to Mariners (Navareas / Hydrolant / Hydropac) should be filed area wise as long as valid (removed when cancelled), in a dedicated file, and relevant ones marked on voyage charts.
Navigational warnings received through EGC or Navtex should also be marked on chart if applicable and the printout retained for 1 year. It is necessary for the Officer on Watch and Master to sign on the printouts and for all officers to sign on the Weather Faxes.
Related Information
How to correct the nautical publications
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