Frame
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) |