Humminbird HDR 650 manual Level Seam aligned with boat hull

NOTE: The transducer must be submerged in water for reliable transducer detection.

4.If the unit is working properly, gradually increase the boat speed to test high-speed performance. If the unit functions well at low speeds, but begins to skip or miss the bottom at higher speeds, the transducer requires adjustment.

5.If you have the correct angle set on the transducer, yet lose a bottom reading at high speed, adjust the height and the running angle in small increments to give you the ideal transducer position for your boat. First, adjust the height in small increments (see the illustration Adjusting the Transducer Mounting Position).

Adjusting the Transducer	Leveling the Mounting
Mounting Position	Assembly Horizontally
	Level

Level

Seam aligned with boat hull

NOTE: The deeper the transducer is in the water, the more likely that a rooster tail of spray will be generated at high speeds, so make sure that the transducer is as high as it can be and still be submerged in the water.

If you are still not getting good high speed readings, you may need to disassemble the transducer mounting assembly and re-position the ratchets (see the illustrations Transducer Knuckle Positions, Ratchets Placed in Position 1, Ratchets Placed in Position 2, and Fitting the Mounting Bracket Over the Ratchet).

21Transom Mount Transducer Installation