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Garmin Markings and Symbols Used in BlueChart
The markings and symbols used in BlueChart are the same as those used on a National Oceanic and Atmospheric Administration (NOAA) paper chart.
NOAA produces a legend of these symbols called Chart No. 1. To view this legend and other information about NOAA charts, please visit the link below.
https://www.nauticalcharts.noaa.gov/publications/us-chart-1.html