The ambulance used in the series (a Chevrolet CG313) is a real ambulance formerly owned by Wellington Free Ambulance. In the show, it retains the original registration plate (UL8185) and WFA fleet number (unit 39).
The photo of the Titania wreck is actually that of MV Rena, which ran aground on a reef off the coast of Tauranga, New Zealand in October 2011.
You can see the Post Office in Warkworth , NZ used for the Brokenwood Police Station as George, Arlo & Shae drive through town in the Fire Truck w/ Monty. Both Shows use the same town as a location.