Patent ID: 8577633

Claim:
A personal mobile device comprising: a multi-function handheld portable device housing in which are integrated a display screen; a wireless communications transceiver; a battery charger interface; a temperature sensor; a movement sensor that generates data indicative of linear movement of the device; a gyro sensor having a zero turn rate output that is capable of containing an offset; storage that stores a plurality of gyro zero turn rate offset correction values associated a plurality of different temperature values, respectively; and a programmed processor to access the plurality of gyro zero turn rate offset correction values for correcting an output value of the gyro sensor for zero turn rate offset, wherein the programmed processor is to (a) automatically determine, during in-the-field use of the personal mobile device, when the device is in a motionless state by determining when output from the movement sensor remains within a predetermined zero threshold range for a predetermined time interval and (b) based on gyro sensor output, add a zero turn rate offset correction value to the plurality of gyro zero turn rate offset correction values as a part of a pair of associated temperature and zero turn rate offset correction values.