I agree with JigStix that you aren't going to see near the detail running at faster speeds, no matter where your xducer is mounted. If you're holding the bottom at high speeds, it's mounted correctly. Increase your ping speed to get more detail then read the marks just like you would have back in the days of the old flasher units. A guick flash on the screen at 20 knots could be enough rockfish to blank out the bottom at idle.
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