In the style of the 'hot or cold' pastime find GZ using the temperature clues. The hotter the temperature displayed on the player screen the closer you are. If you move to a farther zone the temperature will decrease. Turn your volume up and listen for the ding dong alert as you cross between zones. One will automatically play when the cartridge loads on your device, provided you are within reasonable proximity to metropolitan Dunedin. If not, move closer in. Good luck!
Caution! This cartridge has been tested in the emulator and on an iPhone 3GS. The cartridge contains multiple active zones and sounds - some inferior devices are not able to handle basic functions such as these.
The cartridge can be downloaded here. Wherigo home page link.