The document specifies requirements for an electromagnetic current meter used to measure near-surface water velocity. It is installed 0.5m deep on a boat's bow to compensate for an ADCP's blanking distance. The sensor measures velocity in two dimensions and is controlled by a signal conditioning unit. Specifications include an ellipsoid sensor accurate to 1% with a 10m cable, and a control unit with RS-232 output updating at 1Hz, operating from 10-15V or 20-30V DC in an IP65 case at 0-50°C and 95% humidity.