Right now, it's a TrueBasic direct access file.

It contains bands of latitude one degree wide which have longitude values for the ends of regions and the associated region number. You search along a band to find the start and stop of a region, given lat-lon value.

I have a program which will take a rectangle and plot the FE regions in it. A mouse click will return lat-lon, region number and region name at that point. Works fine but you can't tell where you are too well without continental outlines.

They are in a different format naturally, all line segments in a 10 degree square grouped together so you don't have to plot more than needed.

Merging them will be tricky but not impossible.

But it's still a DOS program....

Roger