It is normal that all maps are enabled. It is assumed you have maps for different coverage, in this case it is convinient. If you have the same coverage, you must choose the best map and use only one.
Also I am not succeded to get TTS Russian to work. I guess some additional files are needed. Non-TTS voices, created with Garmin Voice Creator are workable (in Russian we have at least 6 custom voices).
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