Periodic lists

To support safe navigation, the Hydrographic Service publishes the most important changes to nautical products. It does so by issuing Notices to Mariners (NtMs). The weekly editions frequently contain periodic lists. The current lists in force are displayed below.

Do you see uncharted dangers, changes or errors in nautical charts? E-mail to

Please report omissions

If you discover any uncharted dangers, changes, or errors in our products, please let us know by sending an e-mail to