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
(Dual-Frequency Transducers only, SeaChamp 2000C DF)
A
The default frequency is 200 kHz, which is best used in shallow water (about 300 feet or less). This frequency is the best choice for about 80 percent of the fresh and salt water sport fishing applications. When you get into very deep salt water, 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 fresh water than in salt water.)
There is a common exception to the rule. Some fishermen on freshwater lakes (or the ocean) like to see their downriggers 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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