It is only a tool. It does not solve any problem all by itself, although it can make
it easier for you to do so. It is not a physical tool but a mathematical one.
Mathematical tools make mental work more efficient, just as mechanical
tools make physical work more efficient. As with any tool, it is important to
understand its use and function before you can apply it effectively. The
purpose of this book is to make you sufficiently familiar with and proficient
in the use of the Kalman filter so that you can apply it correctly and efficiently.