RICKIE,I TALK TO YOU ABOUT MY 859 WITH EXTRA DUCER TO SEE SIDE WAYS,IT HAS THE SWITCH AND CABLE AND SPLITTER CABLE.IT ONLY GIVE CORRECT BOTTOM READING WHEN I TURN DUCER STRAIGHT DOWN,I HAVE EXTRA 2D DUCER FOR BOTTOM,WELL I UNPLUG 2D DUCER AND 2D PIC WAS LOST BUT THE BOTTOM READING STILL WORK ,IF DI DUCER WAS STRAIGHT DOWN BOTTOM READING WAS CORRECT BUT WHEN I TURN IT SIDE WAYS BOTTOM READING GOES WILD. BTW I AM USING ONE SIDE OF SI DUCER FOR DI