I am trying to generate a circular radar or XY scatter point plot using
geographical coordinates referenced to a tower in the aproximate center
(with its own geographical coordinates and the plotted data in 4 quadrants
(+X/+Y, -X/+Y, -X/-Y and +X/-Y) in order to plot the RF field strength of an
FM broadcast station.

I have 5 columns of data:
1 the Latitude coordinates of the tower for center reference.
2 the Longitude coordinates of the tower for center reference.
3 the Latitude coordinates where I took the measurements.
4 the Longitude coordinates where I took the measurements.
5 The RF field strength at the aforementioned coordinates .

I would really appreciate any help with this as it has been quite a few
decades since I have tried Cartisian Co-ordinates, or rectangular to polar
conversions and such. What's left of my brain is starting to get foggy!!!

Dave Whitehead