I needed 1:25000 TASMAP topo maps on my Garmin Dakota 20 GPS. I had the ones I needed in an OziExplorer file format but they were too big for my Dakota 20. OkMaps offered a tiling utility that meant they would be readable by the Dakota. In the attachment are instructions for transferring the files from Ozf.map format to Garmin/Google Earth friendly format via the wonderful OkMaps. Thanks Gian.