That does clear it up, even for me. I was under the impression it was in meters because of the "K" after the distance on the enemy icon. While there is a difference between meters and yards, I don't know that it would be enough to affect game play.
Oh, but I believe elevation, as shown on the map when you select "Field Altitudes", or whatever that selection is, those are measured in feet, right? At least those measurements always worked for me when I've used them as feet.