Not to sound snide, but you will not get the same readings at high speed as you do at slower speeds for many reasons. You may know this, and forgive me if you do, but what would be a 1 inch long mark on your screen while drifting, would be much smaller at 5 knots due to the transducer passing over the "mark" quicker, and then again at say 20 knots that may be no more than a vertical line. Unless you are seeing a huge balls of bait, without adjusting your settings, you'll be hard pressed to see any real marks, let alone individual fish while on plane. Maybe I'm way off, but this is the way it was explained to me.
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