yes you can have it on an sd for your Colorado 400c --put the unlocked IMG in a Garmin directory--
on Nuvi 350 you can add it in your device --rename gmapsupp.img ,if you have space enough or put it in an sd in a Garmin named folder
Thanks for the help.
If I put the file on an SD card in the Garmin directory, do I need to deal with any Unit ID??
Can I swap this SD card to my brother's Garmin 60csx??
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