I agree 100% , on my machine I use Navionics + I've fished the Grand River and a lot of places fishing shows you up on land.The mapping may look good but is very similiar to Navionics on accuracy. Some areas its not even close.
Yes those swaths that have been mapped and available on social maps are accurate but as you can see on the screen shot its to even close to being complete but it is a start.I’m thinking C-MAP Social should be accurate. It’s free downloads from another boater that’s uploaded it ,or you can log your own maps