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OpenCPN
is a phone/laptop app. It is opensource but may cost $5-10. Set it up by downloading charts for state you are going to. === IBoatNavigation === is also a phone/laptop app. It has great graphics and charts of lakes. for Android, I had to pay $20.99 for all the US charts including inland waterways. The windows chart price is $100, I didn't get that. You can create routes with the android app but you can also create them on OpenCPN laptop and export then import the .gpx route files. They look better on iBoat too. Use it in conjunction with the chartplotter/fishfinder on the boat, setting that for the zoomed in view and the phone to see a zoomed out view. the boat device also reads the actual depth and the water temperature.
