The package includes a single or dual-head multibeam echosounder, a HiPap 500 or 350P SSBL acoustic positioning system and a Hain inertial navigation and motion sensing unit together with a bathymetric sensor and doppler log. A complete system can be fitted with either one or two sonar heads, each covering a sector of 1300. Connection to surface mother ships equipped with three integrated computers is via a fibre optic telemetry link.