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Thanks Red90. That makes sense. I'll give it a try and let you know.

Yes, the card has one directory on it named 'Garmin' and within the Garmin directory, the file, gmpsupp.img

I used the tutorial to load the California topos on an SD card (formatted FAT32) and all seemed to go well. The files loaded and the file structure on the card looks like this:

GARMIN
    gmapsupp.img  (425,912 KB)
id.txt


I put the card into the GPS and go to 'Setup-Map-Select Map'  there is nothing showing but the original supplied maps. What am I missing?

The SD card is a SanDisk Ultra 32GB HC

Thanks in advance for help.