Garmin GPSMAP 421s 010-00764-01 Dépliant

  See the Important Safety and Product Information guide in the product box for product warnings and other 

important information.

To turn on the unit, press and release the   

 key. When the Warning 

screen appears, select 

 to view the Home screen. To turn off the 

unit, press and hold the   

 key.

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.
Please visit 

 for additional documentation and information.

May 2009

190-01074-01 Rev. A

Printed in Taiwan

1.  Press and release the  

key.

2.  Select

.

3.  Press left or right on the

to manually adjust the backlight.

  Note: Press the   

 key repeatedly to cycle between 

maximum backlight, minimum backlight, and your manual setting.

1.  Press and release the  

key.

2.  Select

.

3.  Press left or right on the

to switch

between modes.

Use the 

 to move the map pointer ( ) away from your current location and to scroll 

to other areas on the Navigation chart. As you pan past the edge of the current map display, 

the screen scrolls forward to provide continuous map coverage. 

As you move the map pointer, you can view the 

distance and bearing from your current location and 

the map pointer location coordinates in the lower-

right corner of the map.
To pan the map, press up, down, right, or left on the 

.

The Range (-/+) keys control the zoom level, indicated by the scale at the bottom of the 

Navigation chart (

). The bar under the number represents that distance on the map.

1.  From the Navigation chart, use the map pointer ( ) to highlight your

destination and press

.

2.  Select

>

.

3.  Use the map pointer ( ) to select the location at which you want to

make the last turn toward your destination.

4.  Press

. Repeat this step to add additional turns.

5.  Press

to cancel, to undo the last turn, or to begin navigating the

route.

1.  From the Home screen, select

>

>

>

.

2.  Select

or

.

3.  If you select

, use the map pointer ( ) to select the initial location at which you

want to start the new route. If you select

, select the first waypoint on the 

route and press

.

4.  Choose the location of the first turn and press 

. Repeat until the route is complete.

5.  Select

to save the route.

6.  Select the route to edit the route, delete the route, or navigate to the route.
To edit a route:

1.  From the Home screen, select

>

>

.

2.  Select the route to edit.
3.  Select

. You can edit the route name or use the chart or turn list to edit the route

turns.

 From any chart except the Fish Eye 3D, select

>

>

>

.

A trailing line on the chart indicates your track.

 From any chart except the Fish Eye 3D, select

>

>

>

. The track memory is cleared; the current track continues to be recorded.

PoWeR/BACKLIGHt—Press and hold to turn the unit 

on or off; press and release to adjust the backlight and the 

day and night modes.
RANGe (-/+)—Press to adjust the range of the sonar, to 

zoom in or out on a chart, to page up or down on lists, or to 

adjust the backlight level.
RoCKeR—Press up, down, left, or right to move through 

menus, highlight fields, and enter data.
MARK—Press to mark a waypoint.
SeLeCt—Press to select highlighted items.
HoMe—Press to return to the Home screen.
MeNU—Press to access additional settings and configuration options; press to return to the 

previous screen when indicated.

© 2009 Garmin Ltd. or its subsidiaries