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Here is a link for the West Yellowstone/Island Park trail complex as a Garmin Custom Map. Download the Island Park.KMZ file and place in your Garmin/CustomMaps/ directory on either the device or the micro sd card. Make sure to enable Custom Maps in order to view.
This KMZ file has already been processed into tiles to stay below the Garmin resolution limit, so you should be able to just copy directly to your device. If you would prefer to see the map before placing on your device, you can also open in Google Earth and see the overlay.
https://drive.google.com/open?id=1NlC4qwWFd-BGLqDt33PfIazT_IrwHlpE
This KMZ file has already been processed into tiles to stay below the Garmin resolution limit, so you should be able to just copy directly to your device. If you would prefer to see the map before placing on your device, you can also open in Google Earth and see the overlay.
https://drive.google.com/open?id=1NlC4qwWFd-BGLqDt33PfIazT_IrwHlpE
