OZtopo provides an alternative set of maps, suitable for use on Garmin GPS units. It has been designed as a detailed set of topographical maps suitable for bushwalking, 4WDing and general touring. It is comprised of two mapsets, 10m Contours and Roads and Tracks. Both mapsets can be loaded onto a GPS at the same time. They can also be loaded concurrently with any of Garmin's mapping products, eg City Navigator or BlueChart.