Sometimes my thinking goes haywire.( in other words dumb as a stick). I have been reading about Garmin and Humminbird not having down scan built in to their transducers. I have been thinking about putting a transducer and new unit at the front of the boat. This being said does this rule out Garmin and humminbird? Since these two simulate down scan through the use of other crystals, how hard would it be to throw in a few fish just for good measure. I have a Lowrance Elite 7 e/w transducers on the front and back. Is there a difference between true downscan and simulated down scar? Is that why some Humminbird owners complain about not being able to see fish on downscan. True they only show white dots, but it is helpful to use zoom to help determine what you are seeing. Someone who has both. Is there a difference or am I all wet. Thanks ahead for any input or comments......crappie1133