I have two options the one on the boat is 77 / 200 khz, the other option I have is a 50 / 200 khz if both have an issue I will have to run the sonar at 200 while using the Fish Hawk. I was hoping the 50 might work but I will give it a try. Thoughts on how far apart they should be just to avoid turbulence from eachother I never have had two on the same board?