But also remember that in the DI version of that unit you also have the 75 degree wide 455kHz DI sonar beam. This will be wider than a 60 degree wide 83kHz sonar beam and will be able to show smaller sonar returns with more definition due to its use of a higher frequency. That 75 degree beam will cover an area approximately 15.3 feet wide for every ten feet of water depth (Water Depth X 1.53). A 60 degree sonar beam will cover an area equal to the water depth (Water Depth X 1.00).