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.
There were an estimated 6,420,000 cars involved in accidents in the US in 2005. The cost of these accidents exceeds 230+ Billion dollars. There were about 2.9 million injury cases and 42,636 car accident deaths. An average of 115 persons die each day in motor vehicle crashes in the United States -- one every 13 minutes.