First install the OZtopo V2.1 DVD on your PC
Place the OZtopo V2.1 DVD in the DVD drive on your PC and it will autorun
If you have OZtopo V2.0 installed this will be removed as part of the OZtopo V2.1 installation

- Option 1; Reloading your maps to the GPS using the fast map load
After PC installation a master copy of the map file is provided in C:\Program files\OZtopo V2.1\gmapsupp.img
Run C:\Program files\OZtopo V2.1\Unlock_SD_Card.exe
Enter your OZtopo 25 digit unlock code - please double check your unlock code before continuing; if even a single digit is incorrect the maps will not be readable
Copy the updated map file from C:\Program files\OZtopo V2.1\gmapsupp.img to the Garmin folder on your memory card
Note: This option will load the maps to your GPS or memory card but you will not be able to view the maps on your PC unless you already have the MapSource program installed

- Option 2; Reloading your maps to the GPS from MapSource on the PC
Start the MapSource program on the PC then;
Ensure that you have entered your OZtopo unlock code.
To load the maps you will then need to;
    select the Map Tool (odd shaped rectangle)
    select all the map segments you want from OZtopo V2.1 Roads
    change to OZtopo V2.1 10m Contours (drop down box in top left)
    select all the map segments you want from OZtopo V2.1 10m Contours
    'send to device' (GPS with arrow towards it)
MapSource will build an index file on the PC, then build a map file on the PC and then load the map file to the GPS. This may take 60+ minutes depending on your PC.
Note: Not all GPSs come with the MapSource software