I want my motor just deep enough that it stays submersed. Occasionally, in big waves or wake, it may actually come all the way out of the water. I'm doing this for two reasons, the first being that I don't want to spook any more fish than I have to. Secondly, my TM has a transducer on it and I want my sonar to be able to give me as much information as possible. Especially in shallow water, I want to see as much of the water column as I can.