I want to know why the signal that

I want to know why the signal that lost only 2 point.
Therefore, thus that to calculate the distance to 16 kilometers, which disappeared after the fact.
Distance should not that be size missing.
I wanted to know if it was caused by anything.
I want to know how to calculate the B'AT A500 calculate the distance that the
you methods of calculation. To tell I it?
Do you think that the tires are not the problem.
you know it?