Sorry.. it was a few years ago that I did mine..
I use an older model 60CSx.. what are you loading the maps to?
From memory (which isn't very good) the 37mb file is like a base.. then you add the layers.. ie topo50
NZ Topo, Special Purpose Maps, Waypoints and POI - Releases .... the other files you will need.
Once loaded on the card you need to tick some boxes in the unit to use them or not... (from memory once again)
Follow the instructions and you should be fine... like I say my memory is a bit sketchy but you should be able to sort it.
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