The legal basis for the operation of TIGO is a bilateral diplomatic note exchange between the Federal Republic of Germany and the Republic of Chile. This note exchange was prepared in the years 2000 and 2001 and became legally valid by the publication in the Diario Oficial of the Republic of Chile as Decree 489 (Decreto 489) of the Chilean for Ministery of Foreing Affairs at November 29, 2001.
The Decree 489 is available in spanish: Decreto.pdf
The note exchange could be initiated due to a signed "Arrangement for the cooperative operation of the Transportable Integrated Geodetic Observatory (TIGO) in Concepción/Chile" between the Federal Agency for Cartography and Geodesy (BKG) and the University of Concepción (UdeC) as the leader of the Chilean consortium. For this Arrangement the major points of cooperation had been negotiated. It was signed in Frankfurt am Main by the president of BKG and the rector of UdeC on June 21, 2000.