An explanation of terms and symbols used when updating an ADMIRALTY Standard Nautical Chart

Insert Command00:00:22

The 'insert' command is used for adding entirely new information to a chart.

Amend Command00:00:32

The 'amend' command is used when a feature's position remains the same, but one of its characteristics has changed. Amended information will be accompanied by an 'aml' symbol.

Replace Command00:00:48

The 'replace' command is used when one feature substitutes an existing feature, but their position on the chart is unchanged. Replaced information will be accompanied by an 'rpl' symbol.

Introduction to Chart Update Command Types00:00:08

There are five command types used for updating a chart: insert, amend, replace, move, and delete.

Move Command00:01:05

The 'move' command is for features whose characteristics or descriptions are unchanged but are being relocated less than 3 cm on the chart. The new position will be shown with an arrow drawn from the original position. If a feature needs to be moved more than 3 cm, 'insert' and 'delete' commands are used instead.

Delete Command00:01:38

The 'delete' command removes a feature entirely from the chart. Deleted information is marked by double strike-through diagonal and horizontal lines, along with a deletion symbol. For deleting a note, the entire text area is boxed with the title visible and the deletion symbol annotated within the box.