I FISH BP ALL THE TIME,I USE 2D AND DI EACH HELP THE OTHER,AS FOR KNOWING WHERE BP IS ,YOU SHOULD HAVE YOUR DUCER A LITTLE TILTED TO THE FRONT,THIS HELP IN TELLING WHERE BP IS BY TURNING TM LEFT AND IF IT START SHOWING UP THAN IT IS LEFT,AS YOU TURN MOTOR AND WATCH DIRECTION YOU KNOW WHERE BP IS AND WHEN YOU ARE IN MIDDLE OF IT THE 2D SCREEN WILL GET THICK AND THE HIGHEST SPOT ON UNIT WHILE DI WILL SHOW IF FISH ARE IN IT,WIFE AND I FISH SIDE BY SIDE BY TURNING TM I SOMETIMES HAVE TO TELL HER THAT JIG IS TOO HIGH THEN SHE DROPS DOWN TO WHERE FISH OR TO TOP OF BRUSH,YES WE STILL MARK OUR LINES,BUT BEFORE THAT I CAST TO PILES FIRST WITH A MARKER JUST UP WIND OF BRUSH SO THAT WHEN I GET OVER BRUSH MARKER WILL BE IN FRONT OF ME AN NOT SIDE OR BEHIND ME,IF YOU SET 2D UP RIGHT YOU CAN SEE FISH MOVING UP AND DOWN IN BRUSH UNLESS NEW BRUSH WITH LEAVES WHICH DI WILL TELL YOU AFTER YOU LEARN TO INTERPRET IT WELL,SO TO ANSWER QUESTION USE BOTH,NOW TRUE DI WORKS MUCH BETTER THAN BLENDED DI WHICH I DO NOT CARE MUCH FOR ON FRONT