Garmin 60CSx and buy the Garmin TOPO Australia Maps. Can be set to kt / nm / feet or metric. The detail in the mapping software is astounding - even has most bush tracks / creeks on view when you zoom in. If you press "Find" on the handset and scroll down to "Transportation" you'll see most airports / airfields are listed. For those that are not you can create waypoints. It's brilliant for flying & bushwalking.