i know it's already been asked, but

i keep getting feedback & losing depth on plane. HELP!

HUMMINBIRD 597 HD DI

First try to tilt the rear of the transducer down. If this does not help you will need to remount the transducer.

Lower it down farther into the water as well if you can.

Is this on a glass or aluminum boat?

Can you post pictures of where the transducer is mounted?

I had the same problem and I tilted my transducer down just a little and it fixed the problem. I can now run at full speed and still see the depth and bottom. Good luck.