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High boat speed and slow ping speed (caused by the deeper bottom) can
reduce the screen refresh rate. This in turn can reduce the amount of
detail seen on the sonar chart. Try this command only if you are in deep
water, traveling at high speed, and notice a reduction in detail on the
sonar chart. When Limit Search is turned on, the digital sonar will
limit its search for the bottom to the depth range you have set for the
sonar chart.
NOTE:
Turning Limit Search on can cause the digital sonar to lose the bot-
tom in some situations. The digital depth will flash if that occurs.
The sonar chart must be in manual depth range mode to use the Limit
Search command. To switch from auto depth range to manual, press
MENU
until the
R
ANGE
menu appears. Use the arrow keys to select the
desired range. When you're finished, press
PWR
to clear the menu from
the display.
Next, press
MENU DOWN
until the
C
HART
S
ETUP
menu appears, then
press
UP ARROW
to enter the list of Chart Setup commands, where the
L
IMIT
S
EARCH
menu appears. Press
UP ARROW
to turn it on and press
PWR
to clear the menu.
Limit Search menu.
To turn Limit Search off, repeat the above steps but press the
DOWN
ARROW
to select "Off." Also remember to switch the depth range setting
back to automatic. This will restore the digital sonar's ability to auto-
matically track the bottom.
FREQUENCY (Change Transducer Frequency)
(SeaFinder 240DF only)
The SeaFinder 240DF transducer operates with both 200 kHz and 50
kHz. The 200 kHz frequency has a 12° cone angle and the 50 kHz fre-
quency has a 36° cone angle.