StealthFlanker
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Here are some facts you need to know first:
a) For beyond visual range engagement, anti air missiles don't fly a direct part toward targets, they climbed up and dive down in a ballistic arc, that is to maximize the time missiles cruising in thin air, therefore conserving the limited fuel and kinetic energy they have. Without knowing distance to the target and its velocity, you can't do this
For example: AIM-120B envelope is much bigger at high altitude
b) Anti air missiles, especially BVR one, doesn't fly directly where target is at the moment but instead will fly toward the location the target will be at. You need to know target heading, velocity .to do this. To make it easier to understand, you can imagine like when you go bird hunting and aim forward of the flying bird.
c) For BVR engagement, the main seeker of missiles are only online at the terminal phase because the battery life is limited for active radar guided missiles and coolant time is limited for IR guided missiles. You need to know the time it takes to target which is impossible to deduce without knowing distance or target velocity.
So what does these all mean? for beyond visual range engagement against aircraft you need to know: distance to target, its velocity, altitude, heading otherwise you have as much chance of hitting an aircraft as throwing a rock.
Besides, the white area on the screen is very massive, assuming the beam is only 10 degrees, your instrumental range is 400 km, altitude from 0-15 km. That means the adversary could be anywhere inside that volume of 209,444.4 cubic kilometers. For simplification let say your aircraft occupied a box with height, width and length = 15 meters. So we have the volume for aircraft = 3.37x10^-6 cubic kilometers. In short, what you are trying to find is 66,007,240,356.08 times smaller than the total volume you are trying to find. This isn't like throwing a grenade at a person inside a smoke screen, it more like throwing a grenade at a forest while hopping that you will kill a mosquito.
btw you can blank the whole screen too
Actually, modern cruise missiles have more than just GPS and INS
JSM has IIR seeker, passive anti-radar homing, GPS, INS, 2-way datalink
https://stories.kongsberg.com/content/integrating-rf-seeker-jsm
For comparison: old HARMs has passive anti-radar homing, INS
AARGM has MMW radar, passive anti-radar homing, GPS, INS, 2-way datalink
beside modern cruise missiles are designed to operate in Gps denied enviroment as well
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