If you currently own a Navionics Platinum or US/Canada chip with a current valid subscription, you’re in for a nice treat of an addition coming soon. When you update your chip you will be given the SonarCharts Shading functionality which takes your maps to a new level of detail. This will paint your lake bottom with contours of light to dark blue which makes it way easier to pinpoint fish holding and funneling locations. I have attached a screenshot as an example.
Once fully released I will let everyone know so you can get this new feature.