Outline a plot of land on a map

A client has a very old Certificate of Ownership document for a plot of land. We need to show the outline of the plot on Google maps to potential developers.

Sadly the description of the plot is in archaic coordinate system. How do I get this represented on Google maps?

Here is an additional piece of information I could scrape from the document:

Those are some form of coordinates for point A.4589 in the diagram.

Seems I've made some good progress

Map Location

Answer

You need to know the coordinates of at least one point in lat/lon degrees. If you don't have any surveying points, you might take coordinates from a GPS unit if the point is visible.

Using QGIS, you could create the other points of the polygon with the Azimuth and Distance Plugin. Take care to convert the degree-minute bearings into decimal degrees.

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With the additional Information, it is easy to locate the points next to the Abuja-Kaduna Highway. I have taken the Nigerian Minna Datum with UTM 32N EPSG:26332. The accuracy of the Minna datum is reported to be about 3 to 6 meters.

For use in Google Earth, you can convert the corner points into KML format in a last step:

corners
  
    A.4589
      7.213681182925083,9.242681685792601
  
  
    A.4590
      7.21464061889053,9.244143155822583
  
  

    A.4591
      7.215811177177327,9.243701475697776
  
  
    A.4592
      7.215774243544854,9.242327697539729
  
  
    A.4593
      7.214939943530562,9.242397736493757