I keep 3 or 4 2GB SD Cards with different Topo maps on them.
If I do hiking in Germany I put the Topo for Germany in.
The same for France, Belgium and Luxembourg Topo maps.
I do a lot of group hiking and no need to have a lot of different Topo maps on the unit at any one time.
I hope this helps you.
Spoiler: The manual for that Etrex
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