National Network of Regional Coastal Monitoring Programmes

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Note that these are real-time data and are not quality-controlled. Long-range graphs are plotted from a randomised subsample of half-hourly data.

St Mary's Sound


Additional Information

 Wave buoy location  49° 53.53' N  06° 18.76' W
 WMO code  6201053
 Approximate water depth  53 m CD
 Approximate spring tidal range  5 m
 Storm alert threshold  4.47 m


Wave data are measured using a Datawell Directional Waverider Mk III buoy.  The buoy was first deployed on 15 May 2014, at which time the magnetic declination at the site was 3.03° west, changing by 0.17° east per year. Wave direction is reported following the nautical convention, meaning that the direction is where the waves come from, measured clockwise from magnetic north.

The shore station is kindly hosted by the Coastguard Tower.


27/09/2023 The shore station is offline due to a powercut on St Marys.
16/08/2023 Scheduled service
27/02/2023 The buoy was redeployed.
22/01/2023 The wave buoy has come adrift, recovered the same day, and tied up to a mooring buoy. 
10/08/2022 Scheduled service
21/01/2022 Scheduled service
13/04/2021 Scheduled service
15/10/2020 Scheduled service
11/05/2020 The buoy was redeployed.
28/04/2020 The buoy was sent adrift and recovered the same day.
10/04/2020 Scheduled service
21/05/2019 Scheduled service
04/10/2018 The connection has been restored.
22/09/2018 The receiver station has become uncontactable. We are working to get this situation rectified.
11/04/2018 Scheduled service
19/11/2017 Scheduled service
03/09/2017 Contact was lost with the buoy. We are working to re-establish contact.
23/04/2017 Scheduled service
21/10/2016 Scheduled service
20/10/2016 The buoy has been brought ashore for servicing and will be re-deployed at low tide tomorrow
25/02/2016   The buoy was redeployed today.
16/01/2016 The buoy was kindly recovered today by the MV Scavenger and will be inspected and redeployed as soon as possible.
01/01/2016 No data currently being received at the shore station. A local vessel has agreed to bring the buoy in for inspection as soon as conditions permit.
30/12/2015 A power cut this morning caused a data gap of about 6 hours
24/11/2015 Data feed has stopped due to power issues at the shore station. Should be rectified tomorow evening.
15/07/2015 Scheduled service
29/04/2015 A power cut at the shore station caused a data gap between 07:30 and 13:30 GMT
24/11/2014 Scheduled service
15/05/2014 Buoy deployed