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.
Americans are buying more cars (a record 17.5 million last year), driving more (3.1 trillion miles in the U.S. last year) and, yes, dying more, too: 38,300 Americans died in crashes last year, up 8 percent over 2014. About 10 percent of deadly crashes are the fault of distracted drivers, federal regulators say.