How does inertial guidance work?
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“[The missile knows where it is](https://www.youtube.com/watch?v=bZe5J8SVCYQ)” is actually describing inertial guidance.
Inertial guidance is all about trying to figure out where you are based on where you last knew you were with your knowledge of how you’ve moved.
An example of inertial guidance is you closing your eyes and trying to walk around on an open field and your brain guesstimating to work out where you are after having walked around a little. You know where you started and you guesstimate “well, I think from my starting point I traveled forward about 5 feet and then a little left from there 2 feet, so I must be in so and so position.”
In reality, this is terribly inaccurate, which is why inertial guidance on its own is very poor as errors accumulate the further you go.
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