anchor.diff:  OPTK,CG,no,Opotiki,-38.046521999,177.307578963,127.477,NZGD2000,2009-08-20T00:00:00Z,9999-01-01T00:00:00Z
   OROA,CG,no,Oueroa,-40.10435506,176.68067166,279,WGS84,2010-11-08T00:00:00Z,9999-01-01T00:00:00Z
   OTAK,CG,no,Tuapaka Z,-40.816546002,175.170413249,245.0853,NZGD2000,2007-03-07T00:00:00Z,9999-01-01T00:00:00Z
  -OUSD,GN,no,Otago University Survey Department,-45.86950159,170.510920269,26.1582,NZGD2000,1995-01-16T00:00:00Z,9999-01-01T00:00:00Z
  +OUSD,GN,no,Otago University Survey Department,-45.86950159423,170.51092025742,26.1568,NZGD2000,1995-01-16T00:00:00Z,9999-01-01T00:00:00Z
   PAEK,CG,no,Paekakariki Hill,-41.02176626,174.95208121,443.238,NZGD2000,2003-03-22T00:00:00Z,9999-01-01T00:00:00Z
   PAKI,CG,no,Pakihiroa,-37.89398,178.0826,828,WGS84,2010-06-22T00:00:00Z,9999-01-01T00:00:00Z
   PALI,CG,no,Cape Palliser,-41.569229573,175.25478278,624.147,NZGD2000,2007-02-12T00:00:00Z,9999-01-01T00:00:00Z
  
positive.code: VGWN,CG,no,Wahianoa,-39.32692751,175.597857026,1564.718,NZGD2000,2005-05-18T00:00:00Z,9999-01-01T00:00:00Z
  VGWT,CG,no,West Tongariro,-39.115141445,175.589695416,1189.705,NZGD2000,2004-03-19T00:00:00Z,9999-01-01T00:00:00Z
  WAHU,CG,no,Waihua,-39.077210643,177.234413566,219,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  WAIM,LI,no,Waimate,-44.655704985,170.920302371,1044.8612,NZGD2000,2004-12-15T00:00:00Z,9999-01-01T00:00:00Z
  WAKA,SA,no,Waka Mara,-43.5840269,169.8853067,1416.1,WGS84,2000-11-02T00:00:00Z,9999-01-01T00:00:00Z
  WANG,LI,no,Wanganui,-39.786881172,174.821447299,289.6695,NZGD2000,2003-04-10T00:00:00Z,9999-01-01T00:00:00Z
  WARK,LI,yes,Warkworth,-36.434414348,174.662779361,111.2739,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  WEST,LI,no,Westport,-41.744746794,171.806222588,665.377,NZGD2000,2004-09-22T00:00:00Z,9999-01-01T00:00:00Z
  WGTN,LI,yes,Wellington Airport,-41.323457204,174.805893995,26.0344,NZGD2000,1996-05-17T00:00:00Z,9999-01-01T00:00:00Z
  WGTT,GN,no,Wellington Tide Gauge,-41.290439512,174.781595515,42.9673,NZGD2000,1999-12-14T00:00:00Z,9999-01-01T00:00:00Z
  WHKT,LI,no,Whakatane,-37.98168633,177.013877908,231.833,NZGD2000,2009-03-23T00:00:00Z,9999-01-01T00:00:00Z
  WHNG,LI,no,Whangarei,-35.80377163,174.314566474,172.7729,NZGD2000,2003-04-09T00:00:00Z,9999-01-01T00:00:00Z
  WHVR,CG,no,Whangaehu Valley Road,-39.730097955,175.451742011,690.052,WGS84,2011-09-30T00:00:00Z,9999-01-01T00:00:00Z
  WITH,CG,no,Wither Hills,-41.5606413,173.9842523,408,NZGD2000,2009-11-09T00:00:00Z,9999-01-01T00:00:00Z
  WMAT,CG,no,Waiomatatini,-37.825,178.4087,356,WGS84,2010-03-15T00:00:00Z,9999-01-01T00:00:00Z
  
negative.code: PRTU,CG,no,Paparatu,-38.814193241,177.697878483,634.663,NZGD2000,2009-08-17T00:00:00Z,9999-01-01T00:00:00Z
  PTOI,CG,no,Puketoi,-40.60106131,175.99926884,511.639,NZGD2000,2006-03-21T00:00:00Z,9999-01-01T00:00:00Z
  PUKE,CG,no,Puketiti,-38.07141492,178.257359581,468.075,NZGD2000,2004-02-16T00:00:00Z,9999-01-01T00:00:00Z
  PYGR,LI,no,Puysegur Point,-46.16617670042,166.68073494785,253.2365,NZGD2000,2006-12-04T00:00:00Z,9999-01-01T00:00:00Z
  QUAR,SA,no,Quarry,-43.53167985,169.815818961,58.0333,NZGD2000,2000-02-05T00:00:00Z,9999-01-01T00:00:00Z
  RAHI,CG,no,Arahi,-38.916179094,177.086052871,467.092,NZGD2000,2008-05-15T00:00:00Z,9999-01-01T00:00:00Z
  RAKW,CG,no,Raukawa,-39.747201862,176.621161167,334.823,WGS84,2011-02-16T00:00:00Z,9999-01-01T00:00:00Z
  