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Geophysical equipment types used included: CHIRP Sub-bottom Profiler, Echo Sounder and Sidescan Sonar. The survey was undertaken by Wessex Archaeology. Throughout the survey all co-ordinates were expressed in WGS84, UTM zone 29N. Single beam bathymetric data were recorded throughout all stages of surveying and was acquired using a Knudsen 320M single beam echo sounder. The echo-sounder transducer was mounted to the survey vessel, and the transducer draught was measured and entered into the echo sounder to obtain depths relative to the sea-surface. A TSS DMS 2.05 motion sensor was rigidly mounted above the transducer to measure the vertical displacement (heave) and attitude (roll/pitch) of the vessel; this data was interfaced with the echo sounder. The accuracy of the draught and velocity offsets were checked at the start of the survey using the bar check method. Sub-bottom profiler data were acquired using a chirp system. The chirp system used was the new EdgeTech 3100P portable sub-bottom profiling system using a SB-126S tow vehicle. The chirp is a high resolution wideband frequency modulated sub-bottom profiler. The system transmits a frequency modulated pulse that is swept over a full spectrum frequency range (in this case 2-12 kHz). The vertical resolution using 2 – 12 kHz frequency is 8cm and in an area of silts and clays, which is typical for the survey areas of concern, the typical sub-seabed penetration is expected to be up in excess of 10m. Sidescan sonar data were acquired using a Klein 3000 dual frequency towfish. This system collects data at 125kHz and 445kHz simultaneously. The Klein 3000 collects data at both high and low frequencies and therefore produces high quality images suitable for archaeological purposes. High and low frequency data were acquired at a range of 75m throughout the survey. Due to the number of moorings and moored vessels in the harbour navigating along planned survey lines was not always possible. However, full coverage of sidescan sonar data was ensured by acquiring sidescan sonar data at a smaller line spacing and running infill lines where necessary.

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