Bay of Islands

Planning standards that work well in Bay of Islands:

• Be prepared for boat diving as the default. Practice controlled entries and surface procedures.
• Carry an SMB and know how to deploy it, since currents and boat traffic can separate groups.
• Treat cave/arch features as conditions-dependent. If surge is present, stay outside overhead spaces.
• Expect water temperatures from about 15°C in winter to 22°C in late summer. Cold stress reduces decision-making quality; dress warmly for surface intervals.
• If marine mammals appear, follow the sanctuary requirement: no one may remain in the water within 300 m of any marine mammal.

For any suspected decompression illness or serious dive injury:

• Call 111 (New Zealand emergency number) for urgent medical help.
• Contact the Diver Emergency Service (DES) for diving-specific medical coordination.

Local care:

• Bay of Islands Hospital in Kawakawa provides 24-hour accident and medical services.

Hyperbaric support:

• Recompression support for Northland incidents is typically coordinated through Auckland hyperbaric services. Do not self-diagnose or drive long distances without medical advice.

Conservation priorities that directly affect visitors:

• Te Pewhairangi (Bay of Islands) Marine Mammal Sanctuary rules are strict. Your boat may change sites to avoid disrupting dolphins.
• Respect rahui and other local protection measures. Do not take shells or marine life, and avoid touching reef structure.
• Use reef-safe sunscreen and secure all gear so nothing falls overboard.
• Avoid anchoring in restricted bays and use established moorings when provided.

Good operators in the region will explain sanctuary boundaries, wildlife etiquette, and any local restrictions before entry.