Unknown Rounding

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INTERCEPT PROCEDURES TEXTBOOK
Unknown Rounding
The fighter should attempt to determine the bogey's heading whenever the opportunity
presents itself. The process is very simple. Once steady on a heading, whether after the initial or
secondary corrections, round the fighter's heading to the nearest 10 degrees (ie, 352 rounds to
350 degrees). Add or subtract the cut that is now being assumed and the fighter will have the
estimated bogey reciprocal; from there, the heading should be very easy to calculate. Your
initial heading estimate may be off by a lot but after a secondary correction (or two), the fighter
should be able to calculate bogey heading within 20 degrees.
Example #1--No Radar Contact for Initial/Secondary Corrections
(1)
The fighter, Sweep, has steadied-up on a heading of 340º after the initial GCI call of
"Gritrock, picture, single group, Bull 220-42, medium, flank east."
(2)
Once steady, the fighter does not have radar contact after the next GCI call and
therefore commands "Gritrock go tactical for Sweep." GCI responds with "Sweep,
Gritrock, single group, BRA 326-24, medium." The fighter then turns to place the
contact exactly on the nose (new fighter heading 326º.
(3)
Once the fighter is steady, the next two calls are BRA 326-23 and BRA 327-22. After
hearing right drift, the fighter classifies the DOP as left-to-right and counters the drift
by commanding "Right hard" to place the magnetic bearing call at 30ºL AO (with a
(4)
The fighter estimates a 60ºL cut, 30ºR TA. The weapons officer continues to analyze
drift for further corrections.
(5)
The fighter has steadied on 357º after the initial correction.
(6)
Subsequent GCI calls are "328º at 21 miles" (no reaction is made since this is the new
starting point for subsequent drift analysis), and "329º at 20 miles".
(7)
Continuing to analyze the left to right drift, the weapons officer commands the fighter
"Right hard" to counter the drift and place the magnetic bearing call at 50ºL AO. The
turn is commenced immediately after observing any drift - drift is notquantified during
secondary drift analysis.
(8)
The fighter has steadied-up on 019º after the secondary correction.
(9)
The weapons officer now estimates a 100L cut, 50ºR TA, and BH 100º.
(10) The next bearing calls are "329º at 19 miles" and "328º at 17 miles."
(11) After noting the outward drift, the weapons officer commands "Left hard" to place the
bogey at 40ºL AO making the fighter's heading 008º.
(12) The updated estimate is an 80ºL cut, 40ºR TA and BH 110º. Throughout the entire run,
the OUI should be striving to gain contact through good search techniques.
Example #2-Radar Contact for Initial/Secondary Corrections
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