Your GPS unit can be re-programmed at any time so it is compatible with NZTM2000. The new Topo50 maps and coordinates come into effect from the end of September 2009.
Follow these steps to re-programme your GPS:
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Turn the GPS on. You can do this inside as you don’t need to acquire satellites to change settings.
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Press the Page button 3 or 4 times. This will bring up the “Menu” Screen.
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Scroll down to “Set up”, Press Enter.
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Scroll down to “Units”, Press Enter.
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In “Position Format”, (Press Enter to change), Select “User Grid”, Press Enter.
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In the window that comes up you can alter the Grid Reference settings.
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Longitude Origin, Set to E173 00.000
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Scale, Set to 0.9996000
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False E, Set to 1600000.0 – check the number of digits – you may need an initial zero – that is 01600000.0
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False N, Set to 10000000.0
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Select “Save”.
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This will bring you out to the “Units” page.
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Scroll down to “Map Datum”.
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Select “WGS84”.
The GPS unit will now collect positions of Easting and Northings in NZTM/Datum2000.
To go back to the old NZMG/GeoDatum49, change “Position Format” to “New Zealand”. This will set the datum to “Geod Datum 49”.
To reselect the new NZTM/Datum2000 Change “Position Format” to “User Grid” and “WGS84”and you will be good to go.