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INTERCEPT PROCEDURES TEXTBOOK
format. However, during the Unknown and Advanced phases, initial acquisition will be
achieved utilizing GCI Bullseye control.
The Spider Card:
An excellent tool for gaining radar contact or general SA when given Bullseye information is
the spider card. The graphic can quickly be sketched on a blank kneeboard card as on the next
page, with the center of the spider card being the bullseye.
Figure 1
The above spider card shows that a fighter located at Bull 270 - 35nm can determine where
to point the radar to obtain radar contact on a bogey ENE of the fighter position given a picture
call:
"Gritrock, single group, Bull 060-40, medium, heading west."
A prudent operator can quickly draw a dot (or any symbol) at his own position and draw an
arrow (dot, x, or any symbol if heading info is not given) indicating bogey position and heading.
Then the fighter can visualize the magnetic relative bearing at which radar can be pointed in
order to obtain contact. For simple intercepts, the picture can be visualized completely in one's
brain. However, for more complicated battle situations, such a diagram is useful to track
multiple groups of friendlies, bandits and neutrals over a short period of time.
Unknown Intercept Procedures
An unknown intercept is an exercise in drift control, scope interpretation, and target aspect
analysis. Unknown procedures are based on principles introduced earlier in the syllabus:
(1)
Collision bearing is equal to 1/2 the cut in a co-speed environment.
(2)
A bogey on collision bearing will not drift.
121


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