You can inspect the chart symbols via the NOAA viewer at
https://www.nauticalcharts.noaa.gov/enconline/enconline.html
using the maritime identify widget. Tap on the Info icon and you will see a pointer. Click on the pointer and then tap on the map.
This document is what NOAA directs you to for their symbols. https://nauticalcharts.noaa.gov/publications/docs/us-chart-1/ChartNo1.pdf
