The published coordinates take you to, or close to, Te Waharoa o Kahurangi or the Gateway of Kahurangi. There are various information panels in the immediate vicinity where you will find the answers to lead you to the final GZ.
South 41 23 ABC East 172 49.DEF
Flora and Fauna of the Kahurangi:
Powelliphanta – native land snails grow up to A0 cm in diameter
Kahurangi is home to more than half of New Zealand’s 24E0 native plant species
Walking Tracks of the Kahurangi National Park:
There are B huts on the Wangapeka Track
Early Kahurangi Exploration:
There are photos of D early European explorers
Gateway of Kahurangi:
C: Number of natural elements depicted in the kowhaiwhai patterns
F: How many Kaitiaki/Guardian rocks
Checksum A + B + C + D + E + F = 15
please BYOP