The GLORIA system maps the seabed in swaths up to 60 kms wide, depending on water depth. Operating at 6.5 kHz, the resolution of the system is 50 m. GLORIA is an important regional reconnaissance tool in economic surveys, not only for the quality of the images it produces, but also in its 6-8 knot survey speed. This enables wide area surveys such as an Exclusive Economic Zone (EEZ) or a complete continental margin segment to be assessed prior to site survey selection. The lower operating frequency of the system is known to be capable of penetrating several meters into unconsolidated sediments (Hugget et al, 1992). This enables the system to image structures beneath the masking sediment veneers not seen with higher frequency systems.

Figure 6. Schematic of TOBI deep-tow system.

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