Hi John,

you can enter "+init=epsg:2193" (without the ") in the grid setup dialog
to use the projection of the Topo50 for the grid. Or you enter
"+init=epsg:32760" to us UTM projection for the grid.

HTH

Oliver

Am 01.06.2016 um 08:03 schrieb John Groombridge:
> On 30/05/16 00:04, Andre Joost wrote:
>
>
> Thank you André
>
> It's good to know there's an explanation.  I'm not sure how to apply
> it practically.
>
> I found approximate Eastings can be obtained by applying to formula
> /Google/ E/10 + 143500, but the error can be +/-100m.  Not really very
> useful.
>
>
>
> Cheers
>
> *John*
>
>> Am 14.05.2016 um 03:29 schrieb John Groombridge:
>>> >
>>> > If I create a waypoint at  S 41° 11.003  E 174° 52.440, the equivalent
>>> > Topo50 Grid reference is N5439192  E1757172.
>>> >
>>> > If I save and drag the waypoint onto Google Earth, Google Earth displays
>>> > the same Latitude/Longitude, but the UTM coordinates are S5438707 
>>> > E32169.38
>>> >
>>> > Ignoring the N/S 485m error, what is the explanation for the E32169
>>> > display.
>>> >
>> The Topo50 Grid of New Zealand EPSG:2193 is a transverse mercator 
>> projection bases on the 173°E meridian, with a false easting of 1600000m 
>> and a false northing of 10000000m to the equator.
>>
>> The UTM zone of Wellington NZ (UTM 60S, EPSG:32760) is based on the 
>> 177°E meridian, with a false Easting of 500000m to it. Y values for UTM 
>> South are measured from the South Pole.
>>
>> So your point is 500000-32169 meters away from the 177°E meridian.
>>
>> HTH,
>> André Joost
>
>
>
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