Frequency (Change Transducer Frequency) - Lowrance LCX-112C Operation Instructions Manual

Symbols with
FishTrack depths
Sonar Features menu with Fish I.D. Depths selected (left). When the
check box to the left is unchecked, the feature is off. Sonar Page
showing Fish I.D. symbols and FishTrack depths turned on (right).

Frequency (Change Transducer Frequency)

A dual-frequency transducer operates with both 200 kHz and 50 kHz.
The 200 kHz frequency has a 12° cone angle and the 50 kHz frequency
has a 35° cone angle.
The default frequency is 200 kHz, which is best for use in shallow water
(about 300 feet or less). This frequency is the best choice for about 80
percent of the fresh and saltwater sport fishing applications. When you get
into very deep saltwater (300 to 500 feet or deeper) the 50 kHz frequency is
the best choice.
The 200 kHz transducer will give you better detail and definition, but less
depth penetration. The 50 kHz transducer will give you greater depth
penetration, but a little less detail and less definition (Remember, all sonar
units typically read deeper in freshwater than in saltwater.).
There is a common exception to these rules of thumb. Some fishermen on
freshwater lakes (or the ocean) using downriggers like to see them on the
sonar. In many of those cases, you'll see a 50 kHz transducer frequency in
use because the wider cone angle lets them watch the bait.
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