You will need Oziexplorer for the PC and OziexplorerCE for the PDA, Demo versions are available to download from the web site shown below. You will need to convert maps to a format that CE will use, (OZF) Img2Ozf Conversion Utility, this program can be found at the Ozi web site and is a free download.
Convert your Topo maps and install onto you memory card show the program where they are and hey presto.
FAQ can be found at www.oziexplorer.com
Regards