Recommendation 1 of the 85th CIPM (1996)
Coordination of satellite systems providing timing
The Comité International des Poids et Mesures,
- the international value of having both Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) operational with a composite contribution of 48 satellites,
- the desirability of using either or both systems interchangeably,
- that currently significant time differences exist between the two systems,
- that significant differences exist in the coordinate reference frames used for each,
- that other important satellite timing systems are now being designed and developed,
- that the reference times (modulo 1 second) of satellite navigation systems with global coverage* be synchronized as closely as possible to UTC,
- that the reference frames for these systems be transformed to be in conformity with the terrestrial reference frame maintained by the International Earth Rotation Service (ITRF),
- that both GPS and GLONASS receivers be used at timing centres.
* Such as Global Positioning System (GPS). Global Navigation Satellite System (GLONASS), International Maritime Satellite Organization (INMARSAT), Global Navigation Satellite System 1 (GNSSI), Global Navigation Satellite System 2 (GNSS2).