I have got one Garmin NUVI 57LM from Amazon which has USA maps. I got one micro SD card which contained maps of Pakistan from Tracking world Lahore which I inserted in the Garmin. However it is not reading it from the card nor is there any mechanism to transfer the data from card to garmin.
Any suggestions....
Attach your GPS with usb and copy files on its drive. It would not read maps from Microsd.
Garmin used the files name like gmapsupp.img copy that on GPS drive restart and then select map from device menu.
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Will need your expert hands on this....
I did it but i get a message Maps are not unlock, bought a 67LM, it has US maps