After the adjustment, the measurements fit together to a precision of 15 mm (RMS residuals), with 51 distance and depth measurements used to calculate 15 CP positions. The distance and depth measurements were adjusted using Site Recorder 4 software, which calculated the best estimate of position for each survey control point. The position of each excavation frame was then calculated by taking three or four distance measurements and a depth measurement from the top of two diagonally opposite corner posts. The CPs were 8 mm-diameter mild-steel reinforcing bar, hammered into cracks in the rock and marked with yellow plastic discs. The position and orientation of the frames was determined using conventional 3D tape trilateration (Direct Survey Method) referenced to a network of 15 fixed survey control points (CPs) installed on the seabed and positioned relative to each other, and in real world coordinates (WGS 84), using a combination of distance and depth measurements plus position measurements derived from GPS. All finds recovered from each square were individually numbered in relation to their grid position. The frames were positioned as close to the seabed as possible and supported by adjustable legs.
The frames resulted in a series of 3 x 3 m grids that were further separated into nine 1 m squares using rope lines fixed with elastic cords.
For general delivery, post office box, and rural route/highway contract records, this code will always be "B" (both).: Both of Odd and Even
For street, highrise, firm and multi-carrier records, B = Both sides of a street, E = Even side of a street (even-numbered addresses in the range) O = Odd side of a street (odd-numbered addresses in the range). Code that identifies the side or sides of a street for which a given address range is applicable.
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