(Above) Schematic of frames and instruments that were deployed in the surf zone. The frames held 1 Marsh-McBirney electromagnetic current meter (EMC1), 5 SonTek OCEAN acoustic Doppler current meters mounted downward (AD2D, AD3D, AD4D, AD5D) and upward (AD3U) looking, 1 MAVS acoustic travel time current meter (ATT1), 2 sonar altimeters (ALT1, ALT2), and a SETRA pressure gage (PRES). (Bottom Left) Photograph of the right-hand-side frame (top) in the surfzone. (Bottom Right) The XTREE frame being recovered in November 1998 near the Scripps pier. The sensors are described in the right-hand frame schematic of Figure 1.