My raymarine fluxgate compass seems to do a very bad job of calibration when swinging. I have created a little table by checking COG against HDG in a number of races, under sail, in different wind conditions.
I have trouble entering this into Exp.

So I have a table that reads something like this
HDG   COG
27    15
110    91
148  148
188  198
283  293
309 308
330  320

I tried entering this in the exp calc, just two rows, but that resulted in a very bad result, so I am clearly doing it wrong. How does it expect such a table in xml? thanks