User blog comment:Gamer.Matt/Military Terms and Definitions/@comment-71.163.238.81-20130212012519/@comment-1524681-20130212060231

"Heading 3-1-0 angels 3"

Heading is direction in degrees, with 0 representing north, and winding through east, south, and west in that order; 310° is roughly north-by-northeast. "Angels" is altitude in thousands of feet; "angels 3" is 3000 feet.