Check out this site. http://www.navionics.com/en/webapp This a webapp of what's available from Navionics. You can check out the coverage for any of the lakes you fish. If you see what you like, you can buy the Navionics + chip. It's a blank chip that allows you to download up to 2G of mapping in the US and Canada. You could select lakes all over the US. You do not have to pick a specific region. It also has "Sonar Charts" , so you can actually map your own lake with Humminbird combo units.


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