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My recommendation is to get hold of a copy of NP294 – How to Keep your Admiralty Products up-to-date.
Another extremely useful publication is NP5011 – Symbols and Abbreviations used on Admiralty Paper Charts.
Keeping charts updated with the Chart Correction Template helps ensure the safety of your crew and vessel.
The notice will then give you the co-ordinates and correction that you need to apply. Chart Correction Pen - Corrections need to be done with violet ink using pen with an extremely fine nib.
The recommend nib sizes that the United Kingdom Hydrographic Office suggest are 0.18mm to insert information and 0.25mm nib to delete.
How do I draw the symbols/move the marks/extend the sounding lines…….
There are a very diverse number of different corrections that you may need to make.