I am making the y-axis to be Log(value of point) with a super imposed log scale on the trend viewer for the y-scale. When someone scrolls thru it using the navigation buttons on the display, he/she is going to see the log converted point value instead of the actual value of it. Which is what I want to avoid. I have two data logs running where one is strictly for display (log(value of point)), and the other is the actual value of the point. I suppose I could disable the cursor and not display the point value on the trend viewer itself. That way when someone scrolls it, they can reference the trend to the vertical scale and not be confused with the dsplayed value on the trend itself. Just wondering if reverse conversion is possible when a value is read from the saved data log from CF card before it is displyed back on the trend.