Contractors Adapt GPS To Track Trencher Operations

By Jeff Griffin, Senior Editor | December 2011, Vol. 66 No. 12

“Last spring,” Wampler said, “field tile was in very short supply and almost impossible to get. Darrell did business with vendors that I didn’t; I did business with vendors that Darrell didn’t; we both did business with some of the same vendors. By working all of the possibilities we were able to obtain enough materials to keep tiling.

“And employees like being assigned to the tiling crew. There are no traffic control issues, no irate property owners, no onsite engineers, no inspectors and seldom any existing utilities. They are out in the wide open country with nothing getting in their way.”

Jackson Creek Enterprises, (641) 873-6500,

CORS Ag Network

The CORS (continuously operating reference station) network used by Coddington Wampler is similar to agricultural RTK (real time Kinematic) systems. Both rely on RTK base stations to relay correction data providing sub-inch accuracy. However, there are differences in the two systems.

CORS network fixed RTK base stations are placed at intervals of 30 to 45 miles, compared to the six-mile grid typical of dedicated agricultural networks.

Where agricultural networks use 450-megahertz (MHz) or 900-MHz radios to relay correction signals directly from towers to RTK receivers, CORS networks use the Internet to carry correction signals to a cellular modem, cell phone or data card.

Agricultural networks are brand-specific, but CORS RTK is brand-neutral -- with CORS networks, users may employ any brand RTK equipment, provided it is able to use standardized correction data formats provided by the CORS networks.