Firefighters say updates to their multi-million dollar computer system to include the new Northern Gateway Toll Road have made the situation worse.

The Professional Firefighters Union had been complaining that there is no plan in place for the new stretch of road north of Auckland, which runs between Orewa and Puhoi. That has since been addressed, but the union says alterations to the Computer Aided Dispatch System have been rushed through and are wrong.

It says the new road has been labelled as State Highway 17 and the Hibiscus Coast Highway is still being called State Highway 1, which will come as to a surprise to Transit New Zealand and local residents.

The union's Auckland president, Jeff McCulloch says Communications Centre staff have also discovered the toll road has four different plans attached to it and none of them match.

"This means that depending on which plan is used, will depend which fire engine responds and which station it will come from."

Mr McCulloch says the South Eastern Motorway suffers similar problems with staff having to guess which appliances to send in an emergency.