this post was submitted on 29 Nov 2023
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If its used like the INU I had from GD to integrate, the INU is only supplemental to the guidance system. INUs drift surprisingly quickly in real life so I'd imagine it's used in conjunction with cell triangulation, satellite positioning, mems compass, manual input, etc so that when one drops out (jamming maybe) its circle of error (I forget the correct term) doesn't go big quickly.
Fun fact. An INU can figure out its position from an unknown one if its left stationary for a long time (1/2 a day iirc). Something to do with the rotation of the earth but the exact reason I forget.