Garmin pilot does have chart legends but they’re hard to find. Tap on the Documents tab, you may have to tap on …More to find it. In the Documents window, upper right, tap on Catalog. Under FAA DOCUMENTS tap Legends. Tap Sectional Legends. In the list tap on the chart legends that you want, a green arrow will appear on your choices. Tap done and swipe up where you will find your downloaded choices. Garmin pilot map only gives altitudes for special use air space.