The NZ Open GPS maps work well and are routable, and they also have poiints of interest taken from the Zenbu web site ( Zenbu New Zealand. Find Everything.).
You can test the maps in advance on a computer if you have the Garmin Mapsource program installed. You can then try out autorouting, see what POIs are available, and check that you can download the map to your device. There are also topo maps available from the Open GPS site, but mostly not as good as the Garmin ones which seem to be taken from the LINZ topo maps.
Somewhere in the OpenGPS forums there is helpful information about installing Mapsource if you don't already have it installed. Assuming the last version is still available for download from garmin.com or elsewhere.
BTW the latest LINZ topo maps are available for free download in .tif format, but probably not easily transferable to your Garmin.
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