Garmin 521s Guía Del Usuario

Using Sonar

Range—adjust the range of the depth scale on the right side of the 

screen (auto, or to adjust manually, Manual Range).
gain—controls the sensitivity of the sonar receiver (auto, or to 

adjust manually, Manual). To see more detail, increase the gain. If 

the screen is cluttered, decrease the gain.
frequency—when using a dual frequency transducer, select how 

the frequencies appear on-screen (200kHz, 50kHz, dual,

or auto).

Zoom—zoom in to a section of the full screen. The zoom is off, or 

set to No Zoom by default. Four options are available:

No Zoom—turns zooming off.
2x Zoom—twice the magnification.
4x Zoom—four times the magnification.
bottom Lock—locks the zoom window to the bottom. 
Split Zoom—displays the Split Zoom screen (

Noise Reject (available only when gain is set to Manual)—reduces 

on-screen visual clutter (usually from electrical sources) on the 

screen. Select the top slider bar to manually adjust the value of noise 

rejection. Manually adjusting the amount of noise that is rejected 

helps fine-tune the sonar to show the most detail with the least noise.
When frequency is set to dual (and gain is set to Manual),  you 

can individually adjust noise rejection for each frequency.

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