Garmin 188c Manual De Usuario

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•  Btm (Bottom) Split—shows two reduced pictures; the right 

at the original depth scale and the left showing sonar returns 

from the bottom up. All target depths read as a distance from 

the bottom.

•  Btm (Bottom) Lock—displays only the Bottom Lock 

picture (returns from the bottom up) on the full screen. 

However, if Dual Frequency Display is set to Split, then a 

50/200kHz split screen appears.

When activated, the zoomed picture becomes the Sonar Page 

display. You can also cycle through the sonar zoom display levels 

by pressing the IN or OUT keys. The Zoom function can be turned 

off by pressing the 

OUT key until the No Zoom setting appears. 

View/Span—available when a Zoom scale 

other than No Zoom is selected. The View or 

Span setting is used to change the viewing 

range of a zoomed display. If the Zoom is 

set to 2X split or 4X split, only the zoomed 

portion on the left side of the screen is 

affected by the change. If the Zoom is set to 

Bottom Split or Bottom Lock, Span adjusts 

how far off the bottom the unit displays 

data. In Zoom mode, you can control the 

view of the left side of the split.

Gain—allows you to control the sensitivity 

of the unit’s receiver. This provides some 

flexibility in what is seen on the display. 

To see more detail, increase the receiver 

sensitivity by selecting a higher gain 

percentage. If there is too much detail 

or if the screen is cluttered, lowering the 

sensitivity can increase the clarity of the 

display.

Target Level—adjusts how dark or 

light a return (or target) is displayed 

on-screen. A Color Bar (see 

page 86

appears on the right side of the screen 

as you adjust this setting. The higher 

the percentage, the darker the return 

appears. This setting does not increase 

or decrease the unit gain.