Police said a hoax mayday call about a ship in danger tied up emergency services for several hours today.
Police said they received a call about a vessel in danger off Whangārei Heads at about 10.45am.
Agencies spent three hours investigating the call, said Northland Police Senior Sergeant Clifford Metcalfe.
"We had multiple resources deployed from police and Coastguard looking for this vessel, including search and rescue boats and a fixed wing aircraft.
"Not only were these assets tied up, but staff and volunteers were called out."
If there had been a real emergency at the time, lives could have been in danger, he said.
"When Coastguard respond alongside us, it's important to remember that their volunteers often have to leave their work and study to respond.
"It is incredibly frustrating for our staff who are there to help.
"People need to respect the safety of others, and the people and services that are entrusted to keep them safe."
Metcalfe said enquiries are being made into the source of the hoax calls.