(b) Acoustic Doppler Current Profiler (ADCP) observations:
Two ADCPs were located on the western continental shelf of the Yucatan Peninsula at ~11 m depth. These were Nortek-AWACs of 1 MHz, measuring the current profile divided into eight layers, starting 1.4 m above the bottom until 2.6 m below the surface, taking samples every 20 min and averaging the first 60 s of the observations. The ADCPs were used to measure three sites, two of these simultaneously (Table \ref{245505}):