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,-45.86950159,170.5109203,26.16,NZGD2000,1995-01-16T00:00:00Z,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
   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: SUTT,CG,no,Sutton,-45.63416,170.13928,411,WGS84,2016-05-26T00:00:00Z,9999-01-01T00:00:00Z
  TAKL,GN,no,Auckland Tide Gauge,-36.8436,174.7699,50,NZGD2000,2001-07-11T00:00:00Z,2007-07-05T00:00:00Z
  TAKP,CG,no,Takapari Road,-40.061564113,175.962920076,698.854,NZGD2000,2004-01-14T00:00:00Z,9999-01-01T00:00:00Z
  TAUP,LI,no,Taupo Airport,-38.74271665,176.0809947,427.0279,NZGD2000,2002-03-22T00:00:00Z,9999-01-01T00:00:00Z
  TAUW,CG,no,Tauwhareparae,-38.162424733,178.005876841,713.456,NZGD2000,2009-01-01T00:00:00Z,9999-01-01T00:00:00Z
  TEMA,CG,no,Te Maipa,-41.106566527,175.890463218,515.1993,NZGD2000,2007-02-12T00:00:00Z,9999-01-01T00:00:00Z
  TEN2,XX,no,Lake Tennyson Temporary,-42.215018,172.790212,1833.1,WGS84,2016-11-16T00:00:00Z,9999-01-01T00:00:00Z
  
negative.code: VGFW,CG,no,Far West,-39.255,175.5525,2049.505,NZGD2000,2004-03-22T00:00:00Z,9999-01-01T00:00:00Z
  VGKR,CG,no,Karewarewa,-39.094406187,175.641309034,1210.537,NZGD2000,2005-12-01T00:00:00Z,9999-01-01T00:00:00Z
  VGMO,CG,no,Moawhango Dam,-39.407404947,175.754300805,899.61,NZGD2000,2005-03-31T00:00:00Z,9999-01-01T00:00:00Z
  VGMT,LI,no,Mangateitei,-39.384583196,175.470460976,836.527,NZGD2000,2005-02-01T00:00:00Z,9999-01-01T00:00:00Z
  VGNG,CG,no,Ngauruhoe,-39.17556,175.60115,1453.644,WGS84,2014-02-25T00:00:00Z,9999-01-01T00:00:00Z
  VGNT,CG,no,North Tongariro,-39.09867,175.67593,1279.4,WGS84,2016-01-14T00:00:00Z,9999-01-01T00:00:00Z
  VGOB,CG,no,Chateau Observatory,-39.199838765,175.542240377,1161.26,NZGD2000,2004-02-11T00:00:00Z,9999-01-01T00:00:00Z
  