The AGM-114k Hellfire 2 is missing a basic autopilot for when the missile looses track or laser gets turned off making it similar to GPS guidance due to its optical tracking seeker head paired with onboard image memory system. every time you turn off the laser as of right now making it nose dive to the dirt when in actuality it should maintain its current flight path to the last known location of the lasers designation. Hellfire 2 variants and specs as of 2011
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the term you are looking for is inertial navigation or IOG
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This feature is already in War Thunder on the AGM-114K, and has been for years.
It’s called “IOG”.
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As others have mentioned, this is IOG and it’s already in the game. The way you use it is by designating a target with your target point (using the SPI function), you can do this by simply aiming through the gunner sight or in 3rd person with the sight stabilization key. Then make sure you have the option that automatically turns on the laser OFF, you want to launch the missile without a laser lock. Now the Hellfire, or any other weapon with IOG, will guide towards the predesignated spot, of course with inertial drift so it will very likely miss on its own.
If the weapon acquires the laser at any point during the inertial guidance phase, it shuts off the IOG and it will not come back. Now that part I do not know if it’s realistic or not (I have a feeling it’s not), but in WT at least, if the weapon loses the laser after it has once been acquired before, the missile’s surface controls will just lock up and it will just go on a ballistic path. So it will not guide to the previous designated spot after it loses the laser.
That’s how the IOG mechanic seems to work in WT at least. If you have sources for that it resumes inertial navigation to the last known spot after losing the laser, please submit a report. It would at least help the Hellfire quite a bit.