Gidday,
How did you get T4A into your unit then?
Here is one way how to get OSM maps into your GPS:
Head to Worldwide routable Garmin maps from OpenStreetMap. Click all the map tiles you want, enter your email and submit. Wait a few minutes (usually) until a notification email arrives in your inbox. Open it and click the link. On the page you will be presented with three downloads: for Mac, for MapSource and a file called GPSMAPSUPP.IMG. Download the latter.
Connect the GPS and put it into mass storage mode, it should appear as a drive on the PC. If not you either need to download and install the USB drivers from Garmin (admin rights required on the PC), or connect your GPS' memory card to the PC directly, via a card reader.
In the Garmin folder rename the existing GPSMAPSUPP.IMG to something else. These are your existing maps. Then put the new file into the same place.
When you quit mass storage mode the new maps will appear. You can see the maps online at OpenStreetMap.
Cheers,
Peter,
Arrived in Akl a week ago and still waiting for customs...
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