Caernarfon Notice to Mariners – Benthic Survey

The Environment Agency/Briggs Marine are scheduled to undertake a small scale scientific survey (sediment grab sampling) in the Caernarfon Bay area from the vessel Severn Guardian.

Survey Details

Survey Period: 07/04/2026 – 23/04/2026
Survey duration: 2 days
Time on station: 15-60 mins
Survey Vessel: Severn Guardian
Skipper: Mark Williams
Survey Officer: Tom Lord [email protected]

Station	OSGB36 Easting	Northing	OSGB36 OS Reference	DD.DDDD DD	Long DD.DDDDD	DD°MM.MM MM’	DD°MM.MM MM’
CAERN_1	239280	361992	SH 39280 61992	53.130783	-4.403765	53°07.8470’N	4°24.2261’W
CAERN_2	240832	361471	SH 40832 61471	53.126572	-4.380327	53°07.5943’N	4°22.8196’W
CAERN_4	238263	360637	SH 38263 60637	53.118366	-4.406132	53°07.1019’N	4°24.3679’W
CAERN_5	240341	357819	SH 40341 57819	53.09366	-4.385842	53°05.6172’N	4°23.1506’W
CAERN_6	238946	357409	SH 38946 57409	53.09043	-4.406453	53°05.4258’N	4°24.3872’W
CAERN_8	241276	353524	SH 41276 53524	53.055325	-4.369768	53°03.3195’N	4°22.1861’W
CAERN_9	235278	358288	SH 35278 58288	53.084604	-4.451153	53°05.0762’N	4°27.0692’W
CAERN_12	243950	347509	SH 43950 47550	52.961015	-4.421605	52°57.9408’N	4°25.6606’W
CAERN_13	231147	348006	SH 31147 48006	53.002663	-4.517861	53°00.1598’N	4°31.0741’W
CAERN_18	243907	360290	SH 43907 60290	53.111536	-4.401007	53°06.6922’N	4°24.0604’W
CAERN_19	241302	359327	SH 41302 59327	53.107452	-4.372259	53°06.4471’N	4°22.3369’W
CAERN_20	237878	361000	SH 37878 61000	53.118084	-4.453248	53°07.0850’N	4°27.1949’W
CAERN_21	239993	355372	SH 39993 55372	53.037578	-4.480073	53°02.1467’N	4°28.0047’W
CAERN_22	238150	351600	SH 38150 51600	53.053778	-4.480079	53°03.1467’N	4°28.0047’W
CAERN_23	242151	342151	SH 42251 42151	52.949333	-4.423998	52°56.9600’N	4°23.9985’W
CAERN_24	228285	341382	SH 22825 41382	52.942268	-4.559601	52°56.5361’N	4°33.4176’W