Germany and Netherlands map on TomTom ONE 3rd Edition withh 512MB memory

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Why not to give it a try to extend your internal memory with an SD adaptor
With the right Bootloader it must be possible to use up till 32GB SDHC class 10 card, you may store the whole world in it.
There is a manual in Dutch available here above just give it a try to extend the lifetime of your device, it wil be not as fast as the latest devices, but just good enough the to travel from any place to any place.

I don't know where you live exactly, but when close enough to Rotterdam, you're welcome for any assistance
I own an One to, but this One is with 1GB and no possibility to extend the memory at all, I did an attempt without success.
But as far as I know most of these with 512MB devices are ready for an extended memory
Goodluck