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Thanks JD - I fish in the river Murray in Australia and contours don't line up with bottom hardness in all cases. I can see changes in bottom hardness on structurescan and the normal 2d sounder...

Thanks Wayne - I have reefmaster for offline mapping which is great so will try their live mapping option , unfortunately means taking an expensive laptop on the boat. Hardness is more important...

Does sonar charts live show bottom hardness ? After a live mapping solution for bottom hardness