Please notify us if you 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.
If giving the information on paper please use either the version below or that included in NP100. NP100 will be updated with these later versions at the next edition.
Download Hydrographic Notes
Choose the form and accompanying instructions for the type of information you want to send.
H102 - Hydrographic Note (with instructions) for General Information
H102A - Hydrographic Note (with instructions) for Port Information
H102B - Hydrographic Note (with instructions) for GPS observations against corresponding chart positions
Open the file if you want to enter the data on the screen and send it to us as an attachment using the e-mail link below. Remember to save the document before you send it.
Alternatively you can print it out, complete it by hand and then send it by fax or mail.
Email your completed form to: sdr@ukho.gov.uk or fax it to: +44 (0)1823 352561. For urgent information fax to +44 (0)1823 322352 or send by email.
Once we’ve received and processed your data, we’ll acknowledge receipt of it by post or email.
Supporting information
Chart images and photographs - sent either with the hard copy or as attachments to the electronic copy - will help us to clarify your report.
Any format is acceptable. Those most commonly used are Word, Excel, JPEG, TIF, and AutoCAD. File sizes of the hydrographic notes range from approximately 61Kb to 70Kb; however the size of a returned email would depend on any additional attachments that have been made.