Figure 3. Collection of an elevation point using a hand-held global positioning system (GPS) device in shallow water near the confluence of the Naches and Yakima Rivers near Yakima, Washington, 2008. GPS receiver near technician in foreground is a white dome instrument on a 2-meter rod with the GPS controller attached about half-way up the rod. The boat crew in the background is traversing the river collecting data with a rover GPS and echo sounder. (Photograph taken by Karen Payne, U.S. Geological Survey, August 13, 2008.)