After downloading all sonar recordings to my PC and using AutoChart program to remove and edit bad data I made sure that I clicked the update button and received confirmation that the ZeroLine card had been updated.

I put the ZeroLine card back in the Onix but the Bad data still shows up on the screen.
One thing I should add, and I'm not sure if it matters or not, is that the data is for a lake in Northern Ontario and I am currently at home in Wisconsin.

So I am not sure if it is not updating correctly, or if it won't show up correctly until we get on the lake in late May?