After visit in France I found a leak of memory (about 100Mb) on Nuvi 3490. After searching I found folder f:\.System\GPS\rxn\ that occupied this 100 Mb. I found link on this service:

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Praise the Lord, logging was stooped in MSL_Log.txt on 100Mb with the record: FILE AT CAPACITY - NO ADDITIONAL LOGGING AFTER THIS ENTRY! But small temporary files is overwritten during of each phone connecting. Anybody have this virus on your Nuvi?