Garmin 521 User Manual

Using Charts 

Your chartplotter has a worldwide basemap 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.
Mariner’s Eye 3D charts and Fish Eye 3D charts are available 

only if you use a BlueChart g2 Vision SD card. Fishing charts 

are available if you use a BlueChart g2 Vision SD card or if your 

built-in map supports Fishing charts.
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 421, 521, or 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  

 > 

.