Lowrance electronic Lowrance Fish-finding Sonar & Mapping GPS LMS-520C - Manual (Page 87)

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The default frequency is 200 kHz, which is best for use in shallow wa-
ter (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 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.
Sonar Features menu with a frequency of 200 kHz selected.
To change the frequency setting to 50 kHz:
1. From the Sonar Page, press
MENU
| ↓ to
S
ONAR
F
EATURES
|
ENT
.
2. Press →|then press ↓ to
50
K
H
Z
|
ENT
.
3. Press
EXIT
|
EXIT
to clear the menu.
To change the frequency setting to 200 kHz:
1. From the Sonar Page, press
MENU
| ↓ to
S
ONAR
F
EATURES
|
ENT
.
2. Press →|then press ↓ to
200
K
H
Z
|
ENT
.
3. Press
EXIT
|
EXIT
to clear the menu.
HyperScroll ™
See the entry on Ping Speed, which controls the HyperScroll feature.
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