The most complete and accurate maps of the Palmetto Trail are found on the Avenza App. The App is free and the Palmetto Trail maps are free. Most of the maps are geo-referenced (this lets you see your location on the map). Once you have downloaded the maps, you can put your phone in airplane mode (saving battery), and your location will appear on the maps. A few of the maps are either not on the Avenza app or are not geo-referenced properly (Glen Springs Passage, USC Upstate Passage, Hub City Passage), maps are still attainable via the official Palmetto Trail Conservancy website but are pdf's. https://palmettoconservation.org/  Any updates to the trails are made on the official Palmetto Trail website; the maps are not always updated.

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The Palmetto Trail is not complete and there are several road walks. You may have access to the roadwalks through the Alltrails app, but it costs, and personally, I haven't found it to be very accurate. My preference is to download the Google Maps for the area as it will not only give you step by step instructions for getting you from one trailhead to the next, but if you have an emergency or need to resupply, you'll know where gas stations, etc, are while keeping your phone in airplane mode. To do this, open your Google Maps, search for a place (any place). When that location pops up, slide the screen so that you can see all the details about the location. Select the triple dots at the top of the screen and select "Download offline map". Now, you can expand or shrink the area that you would like downloaded.

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If you decide to also hike the Foothills trail, then you'll want to either download the "Foothills Trail" map from the FarOut App at the price of $10.99 or download "The MST Guide" app which includes the foothills trail and is very similar to the FarOut App.