Missing a big lake – i-Boating: Marine Charts & Gps Review

I bought this app to help me on my vacation with Walloon Lake in northern Michigan and it is not on any chard’s! It’s a huge and very well known lake. I don’t understand how this is not available on your app. I would not bought this app if I would have known that this is not a complete representation of lakes .....
Review by not happy boater on i-Boating: Marine Charts & Gps.