[Proj] New Zealand Map grid projection

[Claire Castellazzi]

Hi, 

I've got a problem with the results of the NZMG projection.  
Using proj 4.7.1 (23 sept 2009), I got : 
>proj -I +proj=nzmg 
#2864916.8 6160570.9 
#177d8'19.853"E39d41'14.816"S 

But when I check my results with the Land Information New Zealand (LINZ)

http://www.linz.govt.nz/geodetic/conversion-coordinates/online-conversion-service/converter/index.aspx 
I got : 
# New Zealand Map Grid Northing Easting : 6160570.9 2864916.8         
# World Geodetic System 1984 Latitude Longitude : 39 41 08.483 S 177 08 20.625 E 

That is more than 6 minutes difference in Latitude !... 
Both seems to use the same datum NZGD49. 
I doubt that LINZ could be wrong... 
So may be I did something wrong ? 

Thanks for any help. 
Claire 
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