geocentric International GNSS Service (IGS), "Upcoming switch to IGS20", IGSMAIL-8238 and IGSMAIL-8282, https://igs.org/ 2025-01-21 true false Geodesy. 10176 IGS20 Used for products from the International GNSS Service (IGS) from 2022-11-27 to 2025-02-01. Replaces IGb14 (code 9378). Replaced by IGb20 (code 10783). For most practical purposes IGS20 is equivalent to ITRF2020.