>The dead reckoning a phone does over its accelerometers absolutely yields a position
Accelerometers yes, gyroscopes no. The video covers accelerometers later but hasn't introduced them yet, and the "your phone knows its position" line has a visual of an IC labelled "MEMS gryoscope".
Accelerometers yes, gyroscopes no. The video covers accelerometers later but hasn't introduced them yet, and the "your phone knows its position" line has a visual of an IC labelled "MEMS gryoscope".