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Oh and exactly what area? I'll have a chat so some of my customers :)

use the low frequency,
If its a furuno, Take it off Auto and wind up the "Pre gain" in the initial settings and then try adusting the tvg, medium is a good place to start. And use the gain control....

use the low frequency,
If its a furuno wind up the "Pre gain" in the initial settings and then try adusting the tvg.