Thanks for the replies Del, Andy, Shane;

It's Excel 2000 XY Scatter Chart.

I am not using macros or addins in this section. I didn't create the
charts, and I am not good at charts. It makes sense that I have to extend
my data series. I know I haven't hit the limits of Excel.

In my sourse data properties on the series tab I have the following

1 item listed in the Series Section. it says STATION LOCATION
Name: ="STATION LOCATION"
X Values: is a range of my Eastings Column
Y Values: is a range of my Northing Column.

I cannot find any definition of STATION LOCATION

One other item I am noticing. I guess if I delete a row of data, and then
look at my chart, I see a Label with #REF! how do i fix those as well.

Thanks again
Chad