How to view SonarChart

Own a Navionics card? Don't miss out on 1 ft HD contours included with every product. Normally, you will see Nautical Chart by default, but you can easily switch to SonarChart™ anytime. Choose your GPS Chartplotter brand for detailed video instructions:
Raymarine
Humminbird
Lowrance
Simrad
Instructions may vary, check the owner’s manual for your model.