Garmin 521s User Guide

Using Charts

Your chartplotter has a worldwide map, and a built-in detailed map 

of US inland lakes, or BlueChart g2 cartography for either the USA 

shoreline or a specific country.

Navigation Chart—displays all relevant navigation data 

available on your preloaded maps, including buoys, lights, 

cables, depth soundings, marinas, and tide stations, in an 

overhead view.
Perspective 3d—provides a view from above and behind the 

boat (according to your course), and provides a visual navigation 

aid.
Split Navigation Chart—displays two different zoom levels of 

the Navigation chart at the same time.

Fishing charts and Fish Eye 3D views are available when using 

optional BlueChart g2 Vision preprogrammed SD cards.

fishing Chart—provides a view of the chart with enhanced 

bottom contours and without navigational data. This chart works 

well for offshore deep-sea fishing.
fish Eye 3d—provides an underwater 3D view that visually 

represents the sea floor according to the information on the chart.

Mariner’s Eye 3d—provides a view from above and behind 

the boat as a three-dimensional navigation aid. The BlueChart 

g2 Vision Mariner’s Eye 3D is more detailed than the preloaded 

data.

  NOTE: If you are using a GPSMAP 420/421/520/521/525/526 

(including “s” models), you must insert an optional BlueChart g2 

Vision preprogrammed SD card to view detailed Navigation and 

Mariner’s Eye charts.

Use the Navigation chart to plan your course, to view map 

information, and as a navigational aid.

  To access a Navigation chart, from the Home screen, select  

 > 

.