Not knowing how the TOM TOM works, i do know there are a number of software options for Handheld GPS in Australia.
CO Pilot
Navman Smart ST
which are both street directory type programs, and I also believe UBD is working on one.
Also
Ozi Explorer CE and
Destinator
are great for using maps in the bush and can be used with various types of COTS (consumer off the shelf) maps.
I guess you could contact the makers of the Tom Tom, or put up a post on a site like Pocket PC thoughs or Palm open source. Or email Brain at GPSOZ.com who is the source and should know what you can do.
Mick


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