This is my first visit here on cc I have been learning alot from all of you on here. This is the best fishing site I have found. I just bought a new Hummingbird 581DI from BassPro, installed it on bow of boat transducer on tm. It powers on has temperature, and speed display but no sonar picture no depth display. Oh buy the way I fish Norfork mostly and Bull Shoals some. Thank you.