Why do I need to tag off?
The Snapper system uses GPS (Global Positioning System) information to record which stop you get on the bus or ferry and where you get off. This information is used to calculate the correct discounted fare for the journey.
If you don't tag off the system assumes that you travelled right to the end of the journey. The tag off penalty is set by the bus companies' fare policies and for GO Wellington, Valley Flyer and Airport Flyer this is the full cash fare. So if you don't tag off your fare is calculated to the end of the line, and you don't receive the Snapper discount.