Phone Apps for lake contours

[doitall5000]

I have used navionics and found several place that did not match my new garmin. I'm running a Garmin striker 4 on down scan and running my new garmin 7 sv on side scan and mapping together. I'm very happy with this setup.
I intend to continue mapping willard bay it is working very accurately. It does not change when I pass over past mapped areas. It holds my saved spots and is easy to follow.