Maritime and Coastguard Agency Civil Hydrography Programme sediment samples

BGS Data — National Geoscience Data Centre

The National Geological Repository stores material from samples that are routinely collected from the seabed during the Maritime and Coastguard Agency‘s (MCA) Hydrographic Instruction (HI) Civil Hydrography Programme (CHP) surveys. Seabed sampling is conducted on an approximately 5 km grid with at least one sample being taken in each major textural area identified. All samples are retained and forwarded to the BGS.


Information on the samples is logged in H575 sample forms using the Nautical Classification and Folk Classification schemes. This information goes into the production of nautical charts at the United Kingdom Hydrographic Office (UKHO). The H575 forms are also sent to the BGS and archived in the National Geoscience Data Centre (NGDC) and MEDIN Data Archive Centre.

Sample and data access

The sample material and data are a resource that is openly available for further analysis.

Deposit samples

We also have guidance for depositing MCA CHP samples.


Contact the Core Store ( or access NGR collections to arrange a visit to view or sample the material. 

Please deposit data from any analyses carried out on the samples with the NGDC.

Need more information?

For general NGR and NGDC enquiries or to arrange a visit, please phone 0115 936 3143 or contact our enquiries team

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