OZtopo - Topographical Maps for Garmin GPS units
this is the one i have, vers 3 though so could update if needed.
using base camp on the pc you can create a route but depends if the 1490t can accept route, mine cannot so that feature is unavailable.
have used mine throughout the high country and blue mountains and all the tracks have been shown, some only bike tracks but they are all there.
saying that i am moving to iPad/hema for upcoming outback trip and will have the garmin as a backup.

