According to Hauenstein, the system currently used by the APBA has its origins in one devised in the 1960s by engineers and racers Charles Strang and Edgar Rose of Outboard Marine Corporation (Strang eventually was OMC CEO, and Rose head of engineering at the company). Military spotting scopes, or scanners, were mounted on a pivot atop a tripod at the beginning and end of the surveyed kilometer. An official would sight on the boat’s bow as it approached the starting point and pivot the scanner to track the boat. When the sighted scanner passed a point precisely on the imaginary starting line, it would trigger a switch that, back in the day, would activate a bank of mechanical stopwatches. A similar scanner would sight on the boat at the finish and, as it passed, trigger a switch to stop the watches.