We use "POI Factory" which has downloadable files for all kinds of 'Points of Interest' including Camps and RV Parks. We used it on this trip down to the Rio Grande Valley and found all of the parks we used in the database which we downloaded into our Garmin. Garmin supplies the "POI Downloader" software. It is easy to use. Just connect the Garmin to your computer and select the POI files you want to add.
Google all this for better instructions.
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