Is it? The article doesn't say so. It says they use the accelerometer for detecting the user's current mode of transportation, not the distance. It says they

Is it? The article doesn't say so. It says they use the accelerometer for detecting the user's current mode of transportation, not the distance. It says they use the train schedules to figure out the current location of the train, based on when it started moving and how long it's been moving. They don't mention anything like dead reckoning anywhere, unless I missed it?