@AaronTC05 You may be correct on the latest SonarChart update, I looked a Comfort Lake where I lived for 38 years, SonarChart Contours on Big Comfort are also Way Off. Coon Lake and Ottertail Lake still have very accurate SonarChart contours where I have fished. I contacted Navionics on the issue. Will most likely be Mon. or Tue. before they get back to me due to the 8 hour time zone difference.