GPS can be a pretty tricky subject to understand. A couple of useful points are:

  • All points are given as UTM grid references. These grid references are metres east and metres north from a certain point (eastings and northings), which is determined by the UTM Zone. In Tasmania, the Zone is always 55G.
  • All points on this site are given in the GDA94 datum. This supersedes the older AGD66 used on older Tasmaps, including all the original 1:25K maps. Check the legend section of your map to make sure the datum matches your GPS points.
  • For our purposes GDA94 is equivalent to WGS84, which is the global standard.
  • To convert a GDA94 or WGS84 grid reference to AGD66, subtract 112 from the easting and 183 from the northing. Hence if you mix up your datums, you will be about 150 metres out.

There is a good discussion of this stuff at .

The link below gives all the GPS points recorded in the thesarvo guides in KML format. It is designed so as to be able to be imported into your GPS, but you'll probably need to convert it - maybe to GPX. GPSBabel is good for that kind of thing.

But you can load this file up directly in Google Earth:


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