I use this website for my free TOPO maps
They have maps for all of: Africa, Australia-Oceania, Central-America, Europe, North-America and South-America
If you want Official Garmin Topo maps you will not finds them here.
There are 2 ways to put maps on an Etrex:
One by copying the IMG file to the SD card as posted below.
Then reinstall the SD card.
or
Connect the Etrex to the PC via USB cable and transfer the map info you want to the Etrex via Garmin MapSource
I always download both files the IMG and the install package for MapSource and BaseCamp.
With it being in MapSource you can lay out tracks and send them to the Etrex too.
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