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.

The shore station is kindly hosted by the Coastguard Tower.


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