I have a Navionics Classic East chip which works fine on my six year old lms 320 unit except when I go south on KY Lake it stops giving any details past Big Sandy. I assume because it doesn't read that far down into TN. My question is which one can I switch it to. Does the south map work or do I need a different one. I don't have the extra money right now to buy a new unit or I would and I'm only on KY Lake a couple times a year. It works at Barren where I mostly fish through the summer. Any help is appreciated.
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