I emailed them a while ago and they told me that those maps are the ones that are updated by people who run compatible sonar and upload the info from them. I've found it to be pretty accurate on the more popular lakes but it defaults to navionics maps if there is no sonar dares available.
On the mite popular lakes I've had no problem using it to locate mid lake humps and bars but depending on which lake your are at ymmv.
If anyone knows of a better map pack I'd live to hear about it I would buy it in a second.
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