Before revision: upright=1.5|Multibeam sonar is used to map the ocean floor A multibeam echosounder is a type of sonar that is used to map the seabed.
After revision: (MBES)upright=1.5|Multibeam sonar is used to map the ocean floor A multibeam echosounder is a type of sonar that is used to map the seabed.