This is a bonus cache for the Harbourview - Orangihina Walkway Ad Lab so you need to complete that first to get clues for the final location of this cache.
The link to the Ad Lab can be found here: https://adventurelab.page.link/DHTu
The cache can be found at:
S 36° 50.Banded Rail.Knot.Dotterel
E 174° 39.Matata.(Banded Rail+Knot).Godwit