I have put a 997 SI on my new (used) 692 Fisherman Ranger. I went out and played with the different settings on the SI. Chart speed, sensitivy, speed of boat, etc., can any of you Si user share some settings that best work for you. My boat is idle at 3.7 mph, to get a better image do I need to slow the idle of motor? What is the best speed for better images? Please give me any advice that would help. Thanks! CG