New Zealand is blessed with some of the best free and open source Garmin GPS maps in the world! This is thanks to strong volunteer communities, and a Government that has come to appreciate the benefits of open access to Government geospatial information.
The New Zealand Open GPS Maps Project provides both auto-routing and topographical maps for New Zealand. Please note that these are for Garmin units only.
- Free Garmin Auto-routing Road maps for the whole of New Zealand - currently 26-29Mb download depending on the format (img file, GMapi, or MapSource installer).
- Free and Open Topographic maps for the whole of New Zealand - make sure to go to the later posts in the thread to find the most recent version. This is a large dataset, currently around 623MB for the whole country.
Recent versions of the Garmin City Navigator Maps include both Australia and New Zealand, so if you have the Australian maps, you should already have the New Zealand Garmin auto-routing maps. Garmin also produce TOPO Australia and New Zealand maps. So if you're coming from Australia, and you have recent Garmin maps, you should already have New Zealand maps as well.
There are also a number of commercial datasets available - mostly topographic maps (sorted alphabetically).