Maritime and Coastguard Agency Civil Hydrography Programme samples

Seabed surface sample and a sample jar
Seabed surface sample and a sample jar

The National Geological Repository at the BGS stores material from samples which are routinely collected from the seabed during Civil Hydrography Programme (CHP) Hydrographic Instruction (HI) 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 and 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.

We have also issued some guidance for the deposit of MCA CHP samples.


For more information contact