2.3 Compass Compass sensor measures magnetic fields. It has an absolute heading measurement. The sensor is very sensitive to outer magnetic sources or interferences. Hence, it required tilt compensation and the field corruption can be solved by using gyroscope sensor in conjunction with compass. The first step of any statistical analysis is to first graphically plot the data. Graphical plots based on correlation are called scatter plots. Scatter plots can visually show the strength of the relationship between variables, the direction of the relationship between variables and whether outliers exist. The purpose of the scatter plots can indicate anything unique or interesting about the data. A wide variety of human-machine interactions learning techniques have been used in human monitoring approaches for motion analysis. This employs a large number of visual and physiological features, a fact which usually impedes the training process.