Why Does Your GPS Arrival Time Keep Changing?
Why Does Your GPS Arrival Time Keep Changing? — The future isn't fixed. But gather enough information and you can sketch the "most likely" version of it. Math isn't magic that predicts the future — it's the honest habit of changing your mind when the information changes.
You're in a car and the GPS says "arriving in 15 minutes." A bit later it says "23 minutes," then "18 minutes." How does it know the travel time for a road you haven't even driven yet? And why does it keep changing its mind?
Picture a time with no cars and no computers. People couldn't answer "how many days from one city to another?" precisely. Good weather meant faster; rain meant slower; bandits meant stopping. So they'd estimate: "about ten days." That idea of "roughly how much" is the seed of the mathematical average, and "the chance it rains and slows you down" is the seed of probability.
Mathematicians realized you can't predict the future exactly, but if you gather many cases you can compute the "most likely answer." If 1,000 people drove the same road and most took 15 minutes, the next person will probably take about 15 too. That's the average. But if there's a crash ahead, the data shifts that instant and the average recalculates. The GPS isn't being moody — every time new information arrives, it simply tells you the most likely answer right now.
- Map and navigation apps: averaging the speed of millions of cars
- Delivery apps: "15 min cooking + 12 min delivery" estimates work the same way
- Flight arrival times, package delivery predictions
- AI weather forecasts: averages and probabilities from decades of data
算 (san) shows old counting rods made of bamboo (竹) handled by two hands — for thousands of years, "figuring out an answer" was called 算. It's exactly what your GPS does as it re-calculates your arrival time every moment.
Meet this hanja in Cheonjamun →The future isn't fixed. But gather enough information and you can sketch the "most likely" version of it. Math isn't magic that predicts the future — it's the honest habit of changing your mind when the information changes.
