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.
1 Over 1,600 children under 15 years of age die each year. 2  Nearly 8,000 people are killed in crashes involving drivers ages 16-20. 3  Road crashes cost the U.S. $230.6 billion per year, or an average of $820 per person.  Road crashes are the single greatest annual cause of death of healthy U.S. citizens traveling abroad.