There can be Cray, but it would really depend on which DI model unit you have. For the 858c HD DI model that gill daddy has he could use a TS3 Transducer Switch and make the needed changes in the Connected Transducer menu each time he changed. This is only possible because the 800, 900 and 1100 series DI units all have the standard 200/83kHz 2D sonar capability (the 300, 500 and 700 series DI units do not).