HOWEVER, he now tells me that he has lost confidence in it because it had to have the recalibration. I explained to him that any precision instrument needs to be recalibrated at times, but he is adamant that the Phantom is now unreliable. So... I'm short on reasons why IMU would need to be recalibrated.
The National Highway Traffic Safety Administration estimates that drowsy driving was responsible for 72,000 crashes, 44,000 injuries, and 800 deaths in 2013.4 However, these numbers are underestimated and up to 6,000 fatal crashes each year may be caused by drowsy drivers.5-7.
The National Safety Council estimated that during 2013, 35,200 people died in US traffic accidents, plus there were about 3.8 million crash injuries requiring medical attention. An agency official blamed most of the accidents on human error. By Richard Read, Guest blogger February 15, 2014.