Put it in same folder with map
If map is in "Garmin" folder then in "Garmin"
If map is in "Map" folder then in "Map"
If map is in "System" folder then in "System" (on some new nuvi 1xxx devices, not SD, there is hidden "System" folder for maps)
To be sure device will find and use it, best is to put it on device, instead SD card
In Explorer -> Tools -> Folder Options -> View, turn on option "Show hidden files and folders" and You will see "System" folder on device and if it's there, put POI files in it
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