On the elite I can change what frequency I use it at. Found on The O I can’t use the 200khz. I use the med chirp or the 83khz setting. Also there are different modes. Fresh, shallow, deep, slow troll, fast troll..........etc. (Lowrance does such a good job describing what each mode does...NOT!). I found fresh or slow troll with the above frequencies works best. Then you can adjust the sensitivity to dial it in. Hope this helps