GPS – Geometrical Product Specification - is the international symbol language for expressing tolerances in technical drawings. It is the only worldwide language available for communicating geometrical requirements on drawings.

GPS is developed through cooperation by more than 60 countries and documented in ISO Standards issued by the International Organization for Standardization.
GPS is a natural development of traditional tolerancing, or Geometrical Dimensioning and Tolerancing, GD&T as it is known in the US. What has been added is much more detailed definitions of the requirements.

This allows designers to express functional requirements much more precisely than was previously possible. The benefit comes from the principals about only concentrating on functional measurements, in stead of making a standard drawing with a lot of measurement without considering the importance of each measurement in the design The potential benefit is a 15% reduction in manufacturing cost, and the payback time for the investment in training and updated documentation can be less than 2 years