You can customize how the map appears in marine mode.

Hold MENU, and select Map > Marine.

Spot Soundings

Enables depth measurements on the chart.

Light Sectors

Shows and configures the appearance of light sectors on the chart.

Symbol Set

Sets the chart symbols in marine mode. The NOAA option displays the National Oceanic and Atmospheric Administration chart symbols. The International option displays the International Association of Lighthouse Authorities chart symbols.