I’m keen to understand how a SatNav works out how to get me from A to B.
I understand at a basic level how it receives a number of GPS signals so can work out where it is. I’d like to know what it then does to navigate me through all the different road systems to get me to my destination.
In: Technology
The SatNav knows where it is at all times. It knows this because it knows where it isn’t. By subtracting where it is from where it isn’t, or where it isn’t from where it is (whichever is greater), it obtains a difference, or deviation. The guidance subsystem uses deviations to generate corrective commands to drive the car from a position where it is to a position where it isn’t, and arriving at a position where it wasn’t, it now is. Consequently, the position where it is, is now the position that it wasn’t, and it follows that the position that it was, is now the position that it isn’t.
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