Page "Nautical chart" Paragraph 12

The nature of a waterway depicted by a chart may change, and artificial aids to navigation may be altered at short notice.

Therefore, old or uncorrected charts should never be used for navigation.

Every producer of nautical charts also provides a system to inform mariners of changes that affect the chart.

In the United States, chart corrections and notifications of new editions are provided by various governmental agencies by way of Notice to Mariners, Local Notice to Mariners, Summary of Corrections, and Broadcast Notice to Mariners.

In the U. S., NOAA also has a printing partner who prints the " POD " ( print on demand ) NOAA charts, and they contain the very latest corrections and notifications at the time of printing.

Radio broadcasts give advance notice of urgent corrections.