Garmin 521 User Manual

Getting Started 

MENU—Press to access additional settings and configuration 

options. Press to return to the previous screen when indicated.

When you turn on the unit, the GPS receiver must collect satellite 

data and establish the current location. When the unit acquires 

satellite signals, the signal strength bars at the top of the Home 

screen are green 

. When the unit loses satellite signals, the 

green bars disappear 

 and the position icon displays a flashing 

question mark.
For more information about GPS, visit the Garmin Web site at  

.

Simulator mode turns the GPS receiver off for use indoors or for 

practice. The unit does not track satellites in simulator mode.



Do not try to navigate using simulator mode, because the GPS 

receiver is turned off. Any satellite signal-strength bars shown are 

only simulations and do not represent the strength of actual satellite 

signals.

1.  From the Home screen, select 

 > 

 > 

.

2.  Select 

 to set speed, track control, and position.

You can view the software version, the basemap version, 

supplemental map information (if applicable), and the unit ID 

number for your chartplotter. You may need this information to 

update the system software or to purchase additional map data.

  From the home screen, select 

 > 

 > 

.

NOTE: This procedure deletes all settings information you have 

entered.

1.  From the Home screen, select 

 > 

 > 

 > 

.

2.  Select 

 to restore all factory settings, or select 

 to cancel. 

).