Dang Ricky it seems when my 998 was new it picked up better. Maybe ive messed with the settinga to much or the updates made it worse.
The transducer can "age" over time due to the ping vibration causing the connection to loosen slightly..... only way to tell is to try your unit with another transducer .... maybe if you know someone else you can test your unit with their setup.
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Looking for the one that makes it all worthwhile.