859 Di combo

Wild@heart[email protected] Posts: 59 Greenhorn
Why is it that when I am at speeds of over 21 mph I can no longer get a depth reading. My old mark 5 makes it to about 32 mph then gives me nothing. It gives me a reading that is just stupid like 384 ft in a lake or river. How do I fix? not much point if I have to idle everywhere...
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