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Geometrical product specifications (GPS). Basic concepts - Geometrical characteristics for quantifying GPS deviations Ingestion-build-115288 by quoting the Functional Units1 Scope This document specifies general rules for quantifying GPS deviations for individual GPS characteristics. NOTE GPS deviations can be local or global. A GPS characteristic defined from local GPS deviations is a parameter that transforms the set of local deviations into a global characteristic using a quantifying function (for more details, see Table 1).