The speed at which the lure is pulled through the water has a great impact on success or failure. For this reason fishermen use devices that accurately track speed. Typically, trolling from one to five knots is the range that allows for fish to be caught. This varies from species to species as Chinook Salmon may prefer higher speeds while the more docile Lake Trout may prefer a much slower-moving lure. Trolling motors are used to calibrate this speed more accurately than large outboard motors. Trolling plates may be used with larger motors to slow the boat to the desired speed, although some anglers experience mixed results using plates.