Mariners are advised to notify and send hydrographic note if discover or suspect:
- New dangers to navigation
- Changes in aids to navigation
- Errors in any navigational publication.
The Mariner’s Handbook (NP 100) Chapter 8 contains details of the information you’ll need to send.
If practicable you should also contact the originating hydrographic office when navigating on IMO-approved non-UKHO nautical charts. Please also comply with national and international law when forwarding such reports.
To see sample of Hydrographic note, Please click here.