Deleting a light, description and sector on an ADMIRALTY Standard Nautical Chart

Begin by using the grid box to reference the NM position on the chart. Then, use the latitude and longitude guides on the tracing and the chart to accurately position the tracing.

Identify the light and description to be deleted. Remove the tracing to expose the chart. Using a magenta 0.25 pen and a ruler, double strikethrough the description text. Also, delete the light and flare with diagonal double strikethroughs.

Relay the tracing over the chart to identify the associated sector for deletion. Using a magenta 0.18 pen, delete the sector with diagonal double strikethroughs over the sector arms, including the associated color and arrowheads.

Finally, lay the tracing back over the chart to confirm that the correct light, description, and sector have been deleted. Once all updates are applied, add the NM update number to the chart's Notices to Mariners section in the bottom left corner.