What you have to do is to open a track file and look to the names given by the nuvi to a recorded track. If you put files withe the same name they will show. You have to set the preferences of the nuvi on show all tracks if possible to switch on/off on this device. I don't know specs of all nuvi's but there is a manual in PDF on the device itself where you will find the specs of this specific device.
Groetjes,
Jeroen
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