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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 salt water sport fishing applications. When you
get into very deep salt water, 300 to 500 feet or deeper, the 50 kHz fre-
quency 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.
Frequency menu with 200 kHz selected.
To change the frequency setting, press
MENU DOWN
until the
C
HART
S
ETUP
menu appears, then press
UP ARROW
to enter the list of Chart
Setup commands. Press
MENU UP
until the
F
REQUENCY
menu appears.
Press
DOWN ARROW
to select
50
K
H
Z
, then press the
PWR
key to clear
the menu. To return to 200 kHz, repeat the steps above, but use the
UP
ARROW
to select
200
K
H
Z
.
DIGITAL DATA SIZE FOR DEPTH, TEMPERATURE, SPEED,
and DISTANCE LOG
The size of the digital numbers for the depth, temperature, speed and
distance log can individually be changed to any one of three sizes. The
digital displays can also be turned off or on.
To change any of these options, press
MENU DOWN
until
C
HART
S
ETUP
appears, then press
UP ARROW
. Use the
MENU
keys to cycle through the
list and display the desired menu, then use the
ARROW
keys to select
the desired number size or turn the numbers off. Press the
PWR
key to
clear the menus.