NZMapConvNZMapConv 
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NZMapConv (nzmapconv.exe). New Zealand Map Reference Converter (NZMapConv) is software that LINZ provides to convert map references between the old NZMS260...
NZMapConv is the official LINZ tool that converts map references between the classic NZMS260 map series and the modern NZTopo50 map series. Designed as a lightweight Windows programme, it offers precise manual coordinate entry for quick, reliable transformations.
Ideal for surveyors, hikers, GIS users, and anyone working with legacy and current maps, NZMapConv simplifies reference checks across datasets. It also fits naturally into workflows needing a dependable coordinate conversion software for maps or a New Zealand topographic map tool.