Messages

This is in regard to my original message
I have done all the above about unchecking the main City Navigator map. The topo map is listed and checked in the map info on the nuvi.
But I get the message on my Nuvi SD card:
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The following disk images failed to mount
gmapsupp.img         no mountable file systems
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thanks--guy
nuvi 200 < nuvi 255W

I down loaded a topo map on my Nuvi 200 but can not get to it. I know it is there because it lists under my system map info along with my City Navigator map.
thanks--guy