Help Comparing Field of View

[Crawfish141]

I'm looking at various acogs, and I'm trying to get an idea of how large their field of view (FOV) is. I have a POSP 4x scope for reference. I'm trying to see which has a a wider FOV at 100 yds. My POSP has a 4x magnification with a 6 degree FOV. This translates out to a 70m FOV at 1000m. The problem is that Trijicons spec sheets are all done with feet at 100yds.

Anyone know enough about optics to tell me what my POSP's FOV is in feet at 100yds?

My POSP :
http://www.kalinkaoptics.com/rifle-...meter-rangefinder-rifle-scope-ak-version.html