Re: haven't heard a good reason why this isn't simply GPS based
GPS can be wildly innacurate - up to 100 meters error
And yet a GPS track of my morning run is almost 100% accurate, so its evidently possible to work out from the data where someone has walked or ran in most instances.
Doesn't work well in dense urban environments with lots of tall buildings
And yet it works perfectly in London which is the densest built city with the highest buildings in the country.
GPS doesn't tell you *where* in the building you are though. I don't need an alert that I have been in close contact with someone on level 20 when I live on level 5.
Bluetooth LE gives you close accuracy, it's not perfect but it is a lot better than GPS.
Biting the hand that feeds IT
