The only way to check the relative position is, first to define, what is the absolute position of a person, is it his other hand, his heart, his head, his foot?
When you defined the absolute position of the person, then you need to use a sensor at that absolute position that can measure the current position, e.g. GPS (if outside), but this is not accurate.
You also can use a gyroscope or device similar to what you use for the glove. When you initially keep them together you now the relative position (around 0.0). Than you can track movement differences of both the glove and the absolute position, send it to the glove (or vice versa) and calculate the difference. There might be calibration issues.
Another way is to use a camera and continueously check for a line of sight signal (IR, led), but this also can have issues (like distance measurement, what if there is no line of sight etc).