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Global Mapper is a geographic information system (GIS) software package currently developed by Blue Marble Geographics [1] that runs on Microsoft Windows. The GIS software competes with ESRI , GeoMedia , Manifold System , and MapInfo GIS products.
Sonar mapping of the Challenger Deep by the DSSV Pressure Drop employing a Kongsberg SIMRAD EM124 multibeam echosounder system (26 April – 4 May 2019). The Challenger Deep is a relatively small slot-shaped depression in the bottom of a considerably larger crescent-shaped oceanic trench, which itself is an unusually deep feature in the ocean floor.