I had a reply in a private message but am unable to thank the person until I have posted 15 messages.
To help anyone else who has the same problem I copy below the solution for Nuvi 255W
ZB
Your nuvi recognize from SD from folder Garmin only two maps, one with name gmapsupp.img and other with gmapsup1.img
In your nuvi internal memory nuvi recognice maps in folder Garmin with this name: gmapprom.img, gmapprom1.img and gmapsupp.img.
So you can use 5 maps for different country, on nuvi memory in folder Garmin 3 and on SD in folder Garmin 2 with name gmapsupp.img and gmapsup1.img



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