The cache is called "Flick the Little Fire Engine" because GZ is the site of the old Invercargill Fire Station. It is now a public carpark run by the city council. It can be busy so pick your times to visit. You may require more than one visit to spot and retrieve the cache. It is a 4.5/1.5 for a reason. There maybe a bit of GPS bounce.
Please do not leave any spoilers or hints in your log. These will be edited or deleted.
Happy to give a hint after the FTF and you have had an attempt.
PS There may be one or two decoys about .