Hydrographic Surveys of the Missouri River at Langdon backwater, 2011-13
An Innerspace 456 single-beam echosounder in conjunction with a Trimble® differential Global Positioning 
System (DGPS), HYPACK® navigation software, and Ashtech Z-Xtreme and Trimble® R8 Global Navigation 
Satellite System (GNSS) receivers was used to survey 7 chutes and 3 backwaters on the Missouri River 
yearly from …