Inertial Measurement Unit
Magnetic compass + MEMS-based electronic pedometer + barometric altimeter + DSP
Designed to work in combination with differential GPS
- Takes over location determination when GPS fails
- Resynchronizes when GPS is reacquired
Position error of 2-5% of total distance traveled
Point Research Dead Reckoning Module
- Worldís most expensive pedometer ($2,200)
- Compact (half-inch thick credit card)
- Lightweight (1.5 oz = 43 g)
- Works indoors
- www.pointresearch.com