NIMROD,I FISH BP MUCH OF THE TIME AND GO FROM ONE TO THE OTHER BUT I DO IT WITH BIG ENGINE,I AM NOT A TROLLER SO I DO NOT LIKE A SI ON FRONT,HAD ONE THERE AND GAVE IT TO MY GRANDSON.HERE'S HOW I DO IT,I HAVE 1199 ON CONSOLE WITH A 859 ON CONSOLE ALSO,THE DI WILL TELL ME IF FISH ARE ON THE PILES AND IF THEY ARE BIG ENOUGH TO STOP OR KEEP GOING WHILE THE SI WILL TELL ME IF I WENT STRAIGHT OVER THEM OR WHICH SIDE THEY ARE ON ,THEN IF I DECIDE TO STOP I THROW OUT A MARKER AND CAN TELL WHICH SIDE THE MARKER THE BRUSH IS ON AND TURN AROUND AND CAST TO IT THEN GO OVER IT AND JIG IT.THE DI LET ME KNOW WHAT I WANT TO DO BEFORE I GET THERE BY THE TRANSDUCER BEING AT THE FRONT.ALSO I HAVE ON THE DI A SWITCH I CAN FLIP AND HAVE ANOTHER TRANSDUCERH AT BACK TILTED TO SIDE SO I CAN SEE FISH UNDER DOCKS AND CAN TELL WHERE THEY ARE LOCATED ON THE DOCK AND HOW FAR FROM ME SO I KNOW WHERE TO SHOOT FIRST. ON THE BOW I HAVE 2D AND DI TO SEE FISH IN THE PILES WHICH WITH HUMMINBIRD SI AND NOT TRUE DI CAN NOT SEE THE FISH WELL