The weekly combined EPN positions have been tied to successive reference frames of the International Terrestrial Reference System, mostly in accordance with IGS reference frame changes:

Type Period (GPS week) Reference Frame Reference stations Alignment method Available from
Operational Jul 1996 - Feb 1998
(0860 - 0946)
ITRF94 BRUS00BEL, GRAZ00AUT, KOSG00NLD, MATE00ITA, METS00FIN, ONSA00SWE, WTZR00DEU, ZIMM00CHE Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Mar 1998 - Oct 1998
(0947 - 0981)
ITRF96 BOR100POL, GRAZ00AUT, KOSG00NLD, MATE00ITA, ONSA00SWE, POTS00DEU, REYK00ISL, VILL00ESP, WTZR00DEU, ZIMM00CHE, ZWEN00RUS Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Nov 1998 - Jul 1999
(0982 - 1020)
ITRF96 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, ONSA00SWE, POTS00DEU, REYK00ISL, VILL00ESP, WTZR00DEU, ZIMM00CHE, ZWEN00RUS Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Aug 1999 - Apr 2000
(1021 - 1056)
ITRF97 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, NYA100NOR, ONSA00SWE, POTS00DEU, REYK00ISL, THU100GRL, TRO100NOR, VILL00ESP, WTZR00DEU, ZWEN00RUS Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Apr 2000 - Nov 2001
(1057 - 1142)
ITRF97 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, NYA100NOR, ONSA00SWE, POTS00DEU, REYK00ISL, THU100GRL, TRO100NOR, VILL00ESP, WTZR00DEU Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Dec 2001 - Jan 2002
(1143 - 1147)
ITRF2000 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, NYA100NOR, ONSA00SWE, POTS00DEU, REYK00ISL, THU100GRL, TRO100NOR, VILL00ESP, WTZR00DEU Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Jan 2002 - Jul 2004
(1148 - 1278)
ITRF2000 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, NYA100NOR, ONSA00SWE, POTS00DEU, REYK00ISL, TRO100NOR, VILL00ESP, WTZR00DEU Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Jul 2004 - Dec 2004
(1279 - 1302)
ITRF2000 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, NYA100NOR, ONSA00SWE, POTS00DEU, REYK00ISL, VILL00ESP, WTZR00DEU Heavy constraints on the fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Dec 2004 - Nov 2006
(1303 - 1399)
ITRF2000 BOR100POL, GRAS00FRA, GRAZ00AUT, KOSG00NLD, MATE00ITA, NYA100NOR, ONSA00SWE, POTS00DEU, REYK00ISL, VILL00ESP, WTZR00DEU Minimal constraints conditions on fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Nov 2006 - Apr 2011
(1400 - 1631)
ITRF2005/IGS05 (IGS mails No 5509, 5518, 5526) BOR100POL, BRUS00BEL, CAGL00ITA, GLSV00UKR, GRAS00FRA, HOFN00ISL, JOZE00POL, MATE00ITA, METS00FIN, NICO00CYP, NOT100ITA, NYA100NOR, NYAL00NOR, ONSA00SWE, POLV00UKR, POTS00DEU, RABT00MAR, RAMO00ISR, REYK00ISL, SFER00ESP, TRAB00TUR, TRO100NOR, VILL00ESP, WSRT00NLD, WTZR00DEU, ZIMM00CHE Minimal constraints conditions on fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Apr 2011 - Jan 2014
(1632 - 1767)
IGS08 ACOR00ESP, AJAC00FRA, ALAC00ESP, ALME00ESP, ANKR00TUR, BELL00ESP, BOGO00POL, BOR100POL, BRST00FRA, BRUS00BEL, BUCU00ROU, BUDP00DNK, BZRG00ITA, CAGL00ITA, CAGZ00ITA, CANT00ESP, CASC00PRT, CHIZ00FRA, DRAG00ISR, DUBR00HRV, EBRE00ESP, EIJS00NLD, GENO00ITA, GLSV00UKR, GOPE00CZE, GRAS00FRA, HELG00DEU, HERT00GBR, HOFN00ISL, IENG00ITA, ISTA00TUR, JOEN00FIN, JOZ200POL, JOZE00POL, KELY00GRL, KHAR00UKR, KIRU00SWE, KOSG00NLD, LAGO00PRT, LAMA00POL, LAMP00ITA, LPAL00ESP, LROC00FRA, MALL00ESP, MAR600SWE, MARS00FRA, MAS100ESP, MATE00ITA, MDVJ00RUS, MEDI00ITA, METS00FIN, MIKL00UKR, MORP00GBR, NEWL00GBR, NICO00CYP, NOT100ITA, NYA100NOR, ONSA00SWE, ORID00MKD, PADO00ITA, PDEL00PRT, PENC00HUN, POLV00UKR, POTS00DEU, PTBB00DEU, QAQ100GRL, RABT00MAR, RAMO00ISR, REDU00BEL, REYK00ISL, RIGA00LVA, SASS00DEU, SFER00ESP, SJDV00FRA, SOFI00BGR, SPT000SWE, SULP00UKR, SVTL00RUS, TERS00NLD, THU300GRL, TRO100NOR, TUBI00TUR, UNPG00ITA, VAAS00FIN, VALE00ESP, VARS00NOR, VIL000SWE, VILL00ESP, WARN00DEU, WROC00POL, WSRT00NLD, WTZR00DEU, YEBE00ESP, ZECK00RUS, ZIMM00CHE Minimal constraints conditions (translation only) on fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Jan 2014 - Apr 2014
(1768 - 1787)
IGb08 ACOR00ESP, AJAC00FRA, ALAC00ESP, ALME00ESP, ANKR00TUR, BOGO00POL, BOR100POL, BUCU00ROU, BUDP00DNK, BZRG00ITA, CAGL00ITA, CAGZ00ITA, CASC00PRT, DRAG00ISR, EBRE00ESP, GENO00ITA, GLSV00UKR, GOPE00CZE, GRAS00FRA, HELG00DEU, HERT00GBR, HOFN00ISL, IENG00ITA, ISTA00TUR, JOEN00FIN, JOZ200POL, KHAR00UKR, LAGO00PRT, LAMA00POL, LPAL00ESP, LROC00FRA, MAR600SWE, MAS100ESP, MATE00ITA, MDVJ00RUS, MEDI00ITA, MIKL00UKR, MORP00GBR, NICO00CYP, NOT100ITA, NYA100NOR, ONSA00SWE, ORID00MKD, PADO00ITA, PDEL00PRT, PENC00HUN, POLV00UKR, POTS00DEU, PTBB00DEU, QAQ100GRL, RABT00MAR, RAMO00ISR, REDU00BEL, REYK00ISL, RIGA00LVA, SFER00ESP, SJDV00FRA, SPT000SWE, SVTL00RUS, THU300GRL, UNPG00ITA, VAAS00FIN, VALE00ESP, VARS00NOR, VIL000SWE, VILL00ESP, WARN00DEU, WROC00POL, WSRT00NLD, YEBE00ESP, ZIMM00CHE Minimal constraints (translation only) on fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Apr 2014 - Jan 2017
(1788 - 1933)
IGb08 ANKR00TUR, BOR100POL, BRST00FRA, BUCU00ROU, DRAG00ISR, GLSV00UKR, GRAS00FRA, GRAZ00AUT, HERS00GBR, HERT00GBR, HOFN00ISL, ISTA00TUR, JOZ200POL, JOZE00POL, KELY00GRL, LROC00FRA, MAR600SWE, MAS100ESP, MATE00ITA, MDVJ00RUS, MEDI00ITA, METS00FIN, MORP00GBR, NICO00CYP, NOT100ITA, NYA100NOR, ONSA00SWE, PDEL00PRT, POLV00UKR, POTS00DEU, QAQ100GRL, RABT00MAR, RAMO00ISR, RIGA00LVA, SFER00ESP, SOFI00BGR, THU300GRL, TLSE00FRA, TRO100NOR, UZHL00UKR, VILL00ESP, WSRT00NLD, WTZR00DEU, YEBE00ESP, ZECK00RUS, ZIMM00CHE Minimal constraints (translation only) on fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)
Operational Jan 2017 - present
(1934 - present)
IGS14 AJAC00FRA, BRST00FRA, BRUX00BEL, BUCU00ROU, DRAG00ISR, EBRE00ESP, FLRS00PRT, FUNC00PRT, GANP00SVK, GLSV00UKR, GRAS00FRA, HERS00GBR, HOFN00ISL, JOZE00POL, KELY00GRL, KIRU00SWE, LPAL00ESP, LROC00FRA, MAR600SWE, MAS100ESP, MATE00ITA, MDVJ00RUS, METS00FIN, NICO00CYP, NOT100ITA, NYA100NOR, ONSA00SWE, PDEL00PRT, POLV00UKR, POTS00DEU, QAQ100GRL, RABT00MAR, RAMO00ISR, RIGA00LVA, SCOR00GRL, SFER00ESP, SOFI00BGR, THU300GRL, TRO100NOR, UZHL00UKR, WSRT00NLD, WTZR00DEU, YEBE00ESP, ZECK00RUS, ZIM200CHE, ZIMM00CHE Minimal constraints (translation only) on usable fiducial stations BKG (WWWW/eurWWWW7.[crd|snx|sum].Z)