Guidance and regulation

An overview of the UKHO Archive, accessing our archive and ordering copies of archive material.

• From: UK Hydrographic Office
• Updated: 23 August 2023

Our flexible service can provide tidal information tailored to your specific requirements.

• From: UK Hydrographic Office
• Updated: 29 August 2014

As a Public Authority, the UKHO makes relevant data sets available in compliance with the ‘Infrastructure for Spatial Information in Europe’ (INSPIRE) initiative.

• From: UK Hydrographic Office
• Updated: 1 April 2021

The systematic survey of the UK’s coastal waters

• From: UK Hydrographic Office
• Updated: 7 October 2022

We have a team of experts who specialise in technical aspects of maritime baselines, limits, zones and boundaries.

• From: UK Hydrographic Office
• Updated: 10 July 2019

ADMIRALTY Tide Tables (ATT) format - times and heights of high and low waters, four months per page (A4 portrait)

• From: UK Hydrographic Office
• Updated: 28 April 2021

Times and heights of high and low waters

• From: UK Hydrographic Office
• Updated: 16 July 2014

Find out about MCA’s bathymetric data collection programme, how to share data with MCA, and guidance for offshore developers.

• From: Maritime and Coastguard Agency
• Updated: 1 May 2014

Times and heights of high and low waters, split into morning and afternoon, one month per page, with a table drawn around the data (A4 portrait)

• From: UK Hydrographic Office
• Updated: 28 April 2021

Times and heights of high and low waters, split into morning and afternoon, one month per page, without a table drawn around the data (A4 portrait)

• From: UK Hydrographic Office
• Updated: 28 April 2021

High water-only format, split into morning and afternoon, four months per page (A4 landscape)

• From: UK Hydrographic Office
• Updated: 28 April 2021

Times and heights of high water only, split into morning and afternoon, one month per page, with a table drawn around the data (A4 portrait)

• From: UK Hydrographic Office
• Updated: 28 April 2021

Times of high water for each day of the year, contained on one page (A4 portrait)

• From: UK Hydrographic Office
• Updated: 28 April 2021

Hourly heights, two months per page (A4 portrait)

• From: UK Hydrographic Office
• Updated: 28 April 2021

Times and heights of high waters only

• From: UK Hydrographic Office
• Updated: 16 July 2014

Hourly heights

• From: UK Hydrographic Office
• Updated: 16 July 2014

10 minute heights

• From: UK Hydrographic Office
• Updated: 16 July 2014

Times and heights of high and low waters – alternative structure to Format 8

• From: UK Hydrographic Office
• Updated: 16 March 2015

Times and heights of high and low waters as in Format 12, but accompanied by interval heights (any time interval from a minimum of 1 minute to a maximum of 120 minutes)

• From: UK Hydrographic Office
• Updated: 16 March 2015

How to propose a new survey, what data the UKHO requires for a nautical chart, and how to report safety critical information or errors in our products

• From: UK Hydrographic Office
• Updated: 16 July 2015