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.
In 2010, there were an estimated 5,419,000 crashes, 30,296 of with fatalities, killing 32,999, and injuring 2,239,000. About 2,000 children under 16 die every year in traffic collisions. Records indicate that there has been a total of 3,613,732 motor vehicle fatalities in the United States from 1899 to 2013. Although the number of deaths, and deaths relative to the total US population, declined over most of the previous two decades, the trend reversed in 2015 and continued to move upward in 2016.