Thanks for the response.. Yes, it is saved as when I go back into the AutoChart program on my PC the bad data points no longer exist.
My steps were.
1. Save Sonar recording data from SD Card onto my PC and import into Autochart
2. Edit Bad data points and save, then click the "Update Zeroline card" - Everything looks great on the PC for printing.
3. Reinsert the Zeroline card into the Onix and turn it on.
4. Zoom into the area in Northern Ontario..
Bad data points still showing