Tonight we went on a short trip to a destination 25 miles from home. When we were ready to come home, I selected my home as the destination while we were still in the parking lot.
After generating the route, it showed that the Estimated Time Enroute (ETE) was xx minutes and the Estimated Time of Arrival (ETA) was 8:29:41.
And this was before we had moved one inch! (One centimeter, if there are readers anyplace other than the US.)
How could it know how long it would take if it didn't know how fast we were travelling??? Clearly, it made an estimate. I suspect that it assumed that I would drive at the speed limit, which was indeed my plan. Because we had something in the back of the truck, I drove a couple of mph under the speed limit some of the time.
But I kept watch of the ETA and was amazed at how close it seemed to be to my own estimate. As it turned out, we arrived less than one minute after the time predicted before we had even moved!
You can bet I'll keep my eye on the ETA in the future, to see if I can gather any additional clues as to how it computes ETE. (ETA is just current time plus ETE.)
Any clues from you would be appreciated; leave a comment, please!
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