The nuvi 1xxx series has the advantage/ability to load any number of maps from it's internal memory. Simply create a folder in the root of the nuvi drive called "Map" (no quotes) and copy your desired map into that folder. The map does NOT have to be called gmapsupp.img nor any of the older nuvi naming conventions...in this case you should give it a more descriptive name such as Topomaps.img (or anything else for that matter). The only stipulation is that it ends with the .img extension.
The trick works on SD card too
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