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The nautical charts are classified as listed below ing to the purpose of navigation. Harbor Plans: 1:50,000 and larger scales. Coast Charts: 1:50,000 - 1:300,000. General Charts of Coast: 1:300,000 - 1:1,000,000. Sailing Charts: 1:1,000,000 - 1:4,000,000. General Charts: 1:4,000,000 and smaller scales.

Find the correct edition then search by notice number for the correction. The notice will then give you the co-ordinates and correction that you need to apply. What do I use? Chart Correction Pen - Corrections need to be done with violet ink using pen with an extremely fine nib.

To correct a chart, look up the number of the chart in the index at the front of the NTM, by the chart number there will be a list of all the corrections that relate to that chart. Each correction is given a number to identify it. You then need to look up the correction to discover the details.

NP133A - ADMIRALTY Paper Chart Maintenance Record Enables easy maintenance and cross-indexing of corrections made to ADMIRALTY Charts, as well as a record of weekly NMs, new charts and new editions for auditing.

A good way to keep track of corrections is with a Chart and Publication Correction Record Card system. Using this system, the navigator does not immediately update every chart in the portfolio when a new Notice to Mariners arrives, instead creating a card for every chart and noting the correction on this card.

To correct a chart, look up the number of the chart in the index at the front of the NTM, by the chart number there will be a list of all the corrections that relate to that chart. Each correction is given a number to identify it. You then need to look up the correction to discover the details.

Types of Navigational Chart Correction Notices Permanent Notices. Temporary Notices (T). Preliminary Notices (P). New Edition or New Chart. Blocks.

There are currently two methods of carrying out electronic chart corrections, either via Weekly Updates, CD or downloaded weekly from a recognized electric chart supplier's data. The preferred method will be decided by the Management Office, depending on the communications equipment onboard the vessel.