anchor.diff:  GNBK,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2015-10-01T00:35:02Z,9999-01-01T00:00:00Z
   GRAC,GeoNet,GNS,ASHTECH Z-XII3,GPS,30s,4,geonet,ashtech_r x6,1998-07-10T00:00:00Z,1999-08-03T00:00:00Z
   GRAC,GeoNet,GNS,TRIMBLE 4000SSI,GPS,30s,4,geonet,trimble_r x6,1999-09-16T00:00:00Z,1999-09-22T00:00:00Z
  -GRAC,GeoNet,GNS,ASHTECH Z-XII3,GPS,30s,4,geonet,ashtech_r x6,1999-10-14T00:00:00Z,2001-01-31T00:00:00Z
  +GRAC,GeoNet,GNS,ASHTECH Z-XII3,GPS,30s,4,geonet,ashtech_r x6,1999-10-14T00:00:00Z,2001-01-30T23:59:59Z
   GRAC,GeoNet,GNS,TRIMBLE 4000SSI,GPS,5s,4,geonet,trimble_r x17,2001-01-31T00:00:00Z,2006-08-28T02:05:00Z
   GRNG,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2007-06-14T01:55:00Z,2015-07-23T23:31:35Z
   GRNG,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2015-07-23T23:31:37Z,9999-01-01T00:00:00Z
  
positive.code: LOK1,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2016-11-15T21:44:30Z,2017-11-01T21:07:01Z
  LOOK,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2017-06-15T03:16:40Z,9999-01-01T00:00:00Z
  LRR1,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2016-11-15T04:46:08Z,2017-05-22T00:14:00Z
  LYTT,P Denys,OUSD,LEICA CRS1000,GPS,30s,4,sagenz,leica_lb2 x6,1999-11-15T00:00:03Z,2003-11-24T00:00:00Z
  LYTT,P Denys,OUSD,LEICA RS500,GPS,30s,4,sagenz,leica_lb2 x6,2003-11-24T00:00:00Z,2007-09-26T00:00:00Z
  LYTT,P Denys,OUSD,LEICA GRX1200GGPRO,GPS+GLO,30s,4,sagenz,leica_lb2 x6,2007-09-26T00:00:01Z,9999-01-01T00:00:00Z
  MAHA,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2009-11-16T07:05:30Z,2016-07-18T02:55:01Z
  
negative.code: CMBL,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,3,geonet,trimble_netr9 x4,2013-07-24T00:40:00Z,2014-12-03T01:37:59Z
  CMBL,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2014-12-03T01:38:00Z,9999-01-01T00:00:00Z
  CNCL,P Denys,OUSD,TRIMBLE 4000SSI,GPS,30s,4,sagenz,trimble_r x21,2000-02-05T00:00:00Z,2007-02-01T20:00:00Z
  CNCL,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,sagenz,trimble_5700 x4,2007-02-01T20:00:01Z,2014-02-04T19:00:00Z
  CNCL,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,3,geonet,trimble_netr9 x4,2014-02-04T19:00:01Z,2014-07-09T23:59:59Z
  CNCL,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2014-07-10T00:00:00Z,9999-01-01T00:00:00Z
  CNST,GeoNet,GNS,TRIMBLE NETRS,GPS,30s,4,geonet,trimble_5700 x4,2007-08-21T01:00:00Z,2016-01-14T21:36:27Z
  CNST,GeoNet,GNS,TRIMBLE NETR9,GPS+GLO,30s,0,geonet,trimble_netr9 x4,2016-01-14T21:36:29Z,9999-01-01T00:00:00Z
  