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 | BRUS, GRAZ, KOSG, MATE, METS, ONSA, WTZR, ZIMM | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Mar 1998 - Oct 1998 (0947 - 0981) |
ITRF96 | BOR1, GRAZ, KOSG, MATE, ONSA, POTS, REYK, VILL, WTZR, ZIMM, ZWEN | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Nov 1998 - Jul 1999 (0982 - 1020) |
ITRF96 | BOR1, GRAS, GRAZ, KOSG, MATE, ONSA, POTS, REYK, VILL, WTZR, ZIMM, ZWEN | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Aug 1999 - Apr 2000 (1021 - 1056) |
ITRF97 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, THU1, TRO1, VILL, WTZR, ZWEN | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Apr 2000 - Nov 2001 (1057 - 1142) |
ITRF97 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, THU1, TRO1, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Dec 2001 - Jan 2002 (1143 - 1147) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, THU1, TRO1, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Jan 2002 - Jul 2004 (1148 - 1278) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, TRO1, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Jul 2004 - Dec 2004 (1279 - 1302) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Dec 2004 - Nov 2006 (1303 - 1399) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, VILL, WTZR | 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) | BOR1, BRUS, CAGL, GLSV, GRAS, HOFN, JOZE, MATE, METS, NICO, NOT1, NYA1, NYAL, ONSA, POLV, POTS, RABT, RAMO, REYK, SFER, TRAB, TRO1, VILL, WSRT, WTZR, ZIMM | Minimal constraints conditions on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Apr 2011 - Jan 2014 (1632 - 1767) |
IGS08 | ACOR, AJAC, ALAC, ALME, ANKR, BELL, BOGO, BOR1, BRST, BRUS, BUCU, BUDP, BZRG, CAGL, CAGZ, CANT, CASC, CHIZ, DRAG, DUBR, EBRE, EIJS, GENO, GLSV, GOPE, GRAS, HELG, HERT, HOFN, IENG, ISTA, JOEN, JOZ2, JOZE, KELY, KHAR, KIRU, KOSG, LAGO, LAMA, LAMP, LPAL, LROC, MALL, MAR6, MARS, MAS1, MATE, MDVJ, MEDI, METS, MIKL, MORP, NEWL, NICO, NOT1, NYA1, ONSA, ORID, PADO, PDEL, PENC, POLV, POTS, PTBB, QAQ1, RABT, RAMO, REDU, REYK, RIGA, SASS, SFER, SJDV, SOFI, SPT0, SULP, SVTL, TERS, THU3, TRO1, TUBI, UNPG, VAAS, VALE, VARS, VIL0, VILL, WARN, WROC, WSRT, WTZR, YEBE, ZECK, ZIMM | Minimal constraints conditions (translation only) on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Jan 2014 - Apr 2014 (1768 - 1787) |
IGb08 | ACOR, AJAC, ALAC, ALME, ANKR, BOGO, BOR1, BUCU, BUDP, BZRG, CAGL, CAGZ, CASC, DRAG, EBRE, GENO, GLSV, GOPE, GRAS, HELG, HERT, HOFN, IENG, ISTA, JOEN, JOZ2, KHAR, LAGO, LAMA, LPAL, LROC, MAR6, MAS1, MATE, MDVJ, MEDI, MIKL, MORP, NICO, NOT1, NYA1, ONSA, ORID, PADO, PDEL, PENC, POLV, POTS, PTBB, QAQ1, RABT, RAMO, REDU, REYK, RIGA, SFER, SJDV, SPT0, SVTL, THU3, UNPG, VAAS, VALE, VARS, VIL0, VILL, WARN, WROC, WSRT, YEBE, ZIMM | Minimal constraints (translation only) on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Apr 2014 - Jan 2017 (1788 - 1933) |
IGb08 | ANKR, BOR1, BRST, BUCU, DRAG, GLSV, GRAS, GRAZ, HERS, HERT, HOFN, ISTA, JOZ2, JOZE, KELY, LROC, MAR6, MAS1, MATE, MDVJ, MEDI, METS, MORP, NICO, NOT1, NYA1, ONSA, PDEL, POLV, POTS, QAQ1, RABT, RAMO, RIGA, SFER, SOFI, THU3, TLSE, TRO1, UZHL, VILL, WSRT, WTZR, YEBE, ZECK, ZIMM | Minimal constraints (translation only) on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Operational | Jan 2017 - present (1934 - present) |
IGS14 | AJAC, BRST, BRUX, BUCU, DRAG, EBRE, FLRS, FUNC, GANP, GLSV, GRAS, HERS, HOFN, JOZE, KELY, KIRU, LPAL, LROC, MAR6, MAS1, MATE, MDVJ, METS, NICO, NOT1, NYA1, ONSA, PDEL, POLV, POTS, QAQ1, RABT, RAMO, RIGA, SCOR, SFER, SOFI, THU3, TRO1, UZHL, WSRT, WTZR, YEBE, ZECK, ZIM2, ZIMM | Minimal constraints (translation only) on usable fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |