Lead Computing Optical Sight System aka 'The Gun Snake'. It's not for calculating threat envelopes but rather a representation of the M61 20mm Vulcan cannon's ballistic shell trajectories. You roll your wings and put the general line of your flight path along the target direction of flight vector and pull until the pipper (small circle on the line) moves up to overlay the target airframe shape before pulling the trigger.
The squirreliness of the line is the weapons computer compensating for both target/own motion and the natural fall of the rounds under gravity. If you aren't pulling to shoot something, it just sits there, 'in a puddle', doing nothing. LCOSS can be used with or without radar lockon (in dogfight mode, the radar, if not put into standby, locks onto whatever it finds on the boresight line or in vertical or HUD 'supersearch' modes, rather than forcing the pilot to move tracking cursors around, though he can step or reject the lock if there are multiple threats or friendlies in front of the jet's nose).
If not using radar, the sight relies on gyro precess and the pilot's own eyes on a 1-2 second historical lag basis of 'where the projectiles would now be flying through the pipper if fired a second ago'. If using radar ranging, it works with target plane of motion movement to provide true lead prediction (where the 20mm cannon shells must go to hit if fired now).
Since most close range kill victims never visually see the threat which shoots them but an active radar lock will audibly and visually warn the pilot on his RWR PPI display that someone is looking to gun his brains out; a lot of pilots remain radar silent unless actively shooting a missile to retain that key surprise factor. The simple fact then being that fighter pilots train to 'go tactical' as they come off the target, switching from A2G with CCIP (Continuously Computed Impact Point, a bomb release calculation tool) to dogfight mode with LCOSS primed so that if there is any threat which jumps them; they have guns ready with HEAT missiles backing them up (that growling buzz in the background). Twitchiness under G and threat has been known to make a pilot accidentally fire missiles into friendly aircraft just ahead of them, hence guns first.
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