Visited NZ from the U.S. and tried this app but found it hard to use in Auckland. Mainly because of the districts in the city - NavFree made it difficult to find a street in a district if you were not familiar with district/area names. Bought TomTom NZ and it was great - no problems at all getting round Auckland and the rest of the North Island as well as touring the South Island
whistledow about Navmii GPS Australia & NZ