His Majesty's New Zealand Ship

His or Her Majesty's New Zealand Ship is the ship prefix used to identify warships and shore facilities commissioned into the Royal New Zealand Navy.
It derives from "His Majesty's Ship" used in the United Kingdom. The British monarch is also equally and separately the New Zealand head of state. Should the monarch be female, the designation also changes to "Her" rather than "His" Majesty.
On 1 October 1941, King George VI approved an order-in-council to change the New Zealand Division of the Royal Navy to the Royal New Zealand Navy. The change had little practical effect at that time but switched New Zealand vessels to the HMNZS prefix.