As Ports of Auckland offers a 10 per cent pay rise in exchange for a radical new roster, the Maritime Union says its dispute with the council-owned company is "about job security, not wages".
Business leaders say the union is achieving the opposite, and endangering its members' jobs by not allowing the company to achieve its goal of full operational flexibility to compete with other ports.
They point to the Auckland operation's loss of up to $25 million a year in business removed to other ports by Danish giant Maersk and Fonterra as a casualty of an inflexible waterfront.
The unionists say shipping firms swap ports regularly depending on geographic needs and whatever discount handling rates they can extract.
Union president Garry Parsloe said port company complaints about poor productivity were contradicted by an invitation to staff to a barbecue to celebrate a record rate of container handling for September.