Wow I am blown away this is high level IQ stuff. Something we take for granted, the amount of calculations and things to consider in order to be precise is very fascinating. Even though its high level science and math, but all of its logical once you read about it.

Such as the process of calculating position using the pseudorange and the almanac data. I would of never thought of this lol. It also discusses the importance of correcting for errors in the GPS measurements, such as atmospheric delays and satellite clock errors. (totally makes sense right!) The emphasis of the need for careful processing of raw GPS data to ensure accurate and reliable positioning, it makes sense:)