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
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine 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)
Routine Apr 2011 - Jan 2014
(1632 - 1768)
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)
Routine Jan 2014 - Apr 2014
(1768 - 1788)
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)
Routine Apr 2014 - present
(1788 - present)
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)