Regarding the S/V Nina:
Most rescue coordination centers merely make use of military assets such as a P3 Orion long-range submarine patrol plane. The exact equipment aboard is not revealed. Now, I will admit there are not very many submarines approaching New Zealand with hostile intent. Its been a long time since the French paid a few visits to New Zealand in preparation for the voyage of Rainbow Warrior.
The long range marine surveillance flights are conducted for military purposes but the major effort right now is smuggling interdiction: drugs and refugees from the poverty and political instability in the area. Even with drugs, a good portion of the drugs smuggled into New Zealand waters are merely transshipped to richer markets in Australia. All nations wish to protect their fisheries and marine economic zones from premature depletion or fouling by ships that violate the laws of the sea.
Some searches for submersibles requires looking almost directly downward whereas searching for a dis-masted yacht is often done from an oblique angle. Searches can be in different areas of the spectrum so as to enhance contrasts.
The major point is that only a small portion of the Orion capabilities will be known to the RCC and a far smaller fragment of that information will ever be released by it.
Raw data from radar scans are unlikely to be shared. Algorithms for drift induced by winds or currents are not likely to be shared.
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