Garmin GPSMAP 421s 010-00764-01 Manuale Utente

Using Sonar

Use the Split Frequency screen (dual-frequency transducer only) 

to view both the 50 kHz and the 200 kHz frequencies on the same 

screen. A 50 kHz frequency graph appears on the left. A 200 kHz 

frequency graph appears on the right.

  From the Home screen, select 

 > 

.

Use the Split Zoom screen to view the full sonar data from the graph 

and a zoomed in portion on the same screen. 

  From the Home screen, select 

 > 

.