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The GLORIA sidescan sonar is a side-scan sonar system for determining the topography of the ocean floor. GLORIA stands for Geological Long Range Inclined Asdic.
Like most side-scan sonars, the GLORIA instrument is towed behind a ship. GLORIA has a ping rate of two per minute, and detects returns from a range of up to 22 km either side of the sonar fish.
References
GLORIA sidescan sonar Wikipedia(Text) CC BY-SA