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Hydrographic Notes


An easy way to inform us of navigationally significant information including suspected dangers and changes to navigational aids.

 

 

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​Hydrographic Notes allow you to inform us of any navigationally significant information. This information could include new or suspected dangers, changes to navigational aids, amendments to details included in publications and suspicious charts or publications that could be counterfeit.


These can be sent in paper format (as outlined below) or sent using the ADMIRALTY H-Note App.

 

What to include in Hydrographic Note submissions


The Hydrographic Note forms below contain information to help you complete any submission. These details are also included within Chapter 8 of the Mariner's Handbook (NP100). Please note that you should also contact the originating hydrographic office when navigating on IMO-approved, non-ADMIRALTY nautical charts.
 

Find out more about the Mariner's Handbook (NP100) >

 

Downloading and sending Hydrographic Note forms


Each of the a forms below contain accompanying instructions to help you complete any submissions. Simply choose the type of information you'd like to send and download the corresponding form.


H102 - Hydrographic Note (with instructions) for General Information 


H102A - Hydrographic Note (with instructions) for Port Information 


H102B - Hydrographic Note (with instructions) for GNSS observations against corresponding chart positions 


H634 - Ornithological Log 


H636 - Marine Bioluminescence Observations reporting form 


H637 - Marine Life / Fishing Activity reporting form 

 

Please 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 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.

The ADMIRALTY H-Note App helps you to send the UKHO reports on suspected dangers to navigation or changes observed in aids to navigation using a mobile device. Free to download and easy to use, the application takes advantage of your mobile’s built-in camera and GPS to help gather important navigational information and to email it to the UKHO once your vessel is in a Wi-Fi or cellular coverage area.


When you submit an H-Note via the App, you will receive an acknowledgement. The information you send will be used by the UKHO to take immediate action or considered for use in the next appropriate revision of a chart or publication.

Download the H-Note App Legal Agreement 

 

Downloading the H-Note app


The H-Note App is available for free on both Android devices and iPhone, iPad and iPod touch. It can be downloaded on Google Play and on the App Store:


Download the H-Note app on Google Play >


Download the H-Note app on the iTunes store >

​The Maritime Information Portal is a free to use resource that allows users to view a variety of information sources, including:

  • Reported and unconfirmed Hydrographic Notes sourced directly from the portal and via the ADMIRALTY H-Note App


  • Product Limits for Standard Nautical Charts (SNCs), the ADMIRALTY Vector Chart Service (AVCS) and ADMIRALTY Sailing Directions


  • Maritime information including anti-shipping activity reports


This is currently a BETA version (ver 0.1) and the data provided on the portal should not be used for navigation.


Access the Maritime Information Portal >