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I think I may have figured this one out on my own. I selected the new map and zoomed out and there was the TOPO.
So it does work. BTW I'm pulling full bars for satellites in my upstairs bedroom. I thought you needed direct contact with the sky?

As my topic states I got it loaded but when I navigate I don't get the topo I get the same old map that came with it? Even if I go to Map info and uncheck the North American Map that came with it.

See thats what confuses me it can use either a micro or a normal how do I know what one my 255W uses?

Is there a special SD card that the Nuvi's use or will anyone work? I have a Nuvi 255W.