X515C DF & X510C Manual - Lowrance

NOTE
These instructions will turn on FishTrack and Fish I.D. at the
same time.
To turn off FishTrack, repeat the instructions in step 2. Turning off
FishTrack in this manner will not turn off Fish I.D. symbols.
Symbols with
FishTrack depths
Sonar Features menu with Fish I.D. Depths selected (left). Sonar Page
showing Fish I.D. symbols and FishTrack depths turned on (right).
Frequency (Change Transducer Frequency)
(X-515cDF only)
The "DF" in your unit's name refers to its dual-frequency transducer,
which 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 fresh water than in saltwater.)
There is a common exception to these rules. Some fishermen, who use
downriggers on freshwater lakes (or the ocean), like to see their bait on
the sonar. In many of those cases, you'll see a 50 kHz transducer frequency
in use because the wider cone angle.
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