How to Change Your GPS for the New Map Datum
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1. scale factor 0 9996 Note that this projection is the same as a Universal Transverse Mercator UTM but with a different origin latitude and different false northing and easting newzealand govi nz MORE TECHNICAL GPS INFORMATION For more technical GPS information please contact your GPS retailer or manufacturer MORE ON THE TOPO50 MAP SERIES For more information check out www linz govt nz topo50 To register for regular email updates on the Topo50 map series email newmapseries linz govt nz May 2009 Information 3 Services Ay Jealant See Land whenua pograp2. Coordinate your GPS system with Topo50 Land Information New Zealand LINZ will be launching a new 1 50 000 topographic map series later this year called Topo50 From September 2009 the entire Topo50 map series will be available from map retailers Topo50 will replace LINZ s existing 1 50 000 scale NZMS260 series while still providing the same representation at 1 50 000 scale A new datum New Zealand Geodetic Datum 2000 NZGD2000 and map projection New Zealand Transverse Mercator 2000 NZTM2000 are being used for the Topo50 maps This means that the latitude longitude and grid coordinates known as eastings and northings will be different from those on the current NZMS260 maps NZGD2000 corresponds to the datum used in modern navigational systems such as the Global Positioning system GPS Transverse Mercator is a projection that is commonly used internationally EMERGENCY SERVICES SHIFTING TO NZTM2000 AND TOPO50 MAPS It is important that your GPS unit fits with the new datum and projection to ensure consistency with the emergency services and defence agencies These agencies will begin using NZTM2000 and the new Topo50 maps for their emergency and base mapping from the time of the map series launch in September 2009 LINZ will also be encouraging map users to purchase Topo50 printed maps that use the NZTM2000 projection newzealand govt nz A GPS unit being used in tandem with a Topo50 map GPS SYSTEM US
3. ERS SETTING THE DATUM NZGD2000 ON YOUR GPS UNIT For those currently using GPS systems you can set your GPS receiver to NZGD2000 the datum used by Topo50 to determine latitudes and longitudes If your GPS does not support NZGD2000 it will still be able to support Topo50 You can simply set your GPS receiver to the default datum setting of World Geodetic System 1984 WGS84 WGS84 is the datum the GPS system uses and for all practical purposes it is the same as NZGD2000 This means that latitudes and longitudes from your GPS receiver will be compatible with those shown on Topo50 maps Information Services New demang Land whenua W X Topographic a SETTING THE PROJECTION NZTM2000 ON YOUR GPS UNIT To get Topo50 grid coordinates eastings and northings check that your GPS unit supports the projection used for Topo50 maps NZTM2000 You can either select the appropriate menu option in your GPS unit or consult the user manual If your GPS does not support NZTM2000 the receiver may have the capability to input a user defined projection Many GPS receivers have this capability You may need to consult the user manual on how to access this feature You will need to set up your receiver with the following NZTM2000 parameters Projection Transverse Mercator Origin Latitude 0 0 degrees South Origin Longitude 173 0 degrees East False Northing 10 000 000 m North False Easting 1 600 000 m East Central Meridian
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