Here's are the steps to remove ChartData from the computer and usb flash drive.

- Delete the downloaded data stored on computer. Here's how:

    Open Data Manager
    Click 'Options...'
    Disable 'Allow simultaneous downloads'
    Click 'Advance...'
    Click 'Open the download folder on this PC'
    Delete all files -and- folders that begin with 'GenericChartData' 
    Delete the folder 'ScannedCharts'

- Delete data stored on the memory card. Here's how:

    Delete the ChartData folder on the USB flash drive
   
Click 'Download Now' to download a new copy of data to the computer. Once downloading has finish, data will be copied to the usb flash drive.