What Other Settings Affect The Fishfinder Image; What Are The Operating Frequency Modes - Raymarine C-Series Reference Manual

Chapter 7: Using the Fishfinder

7.9 What other settings affect the fishfinder image?

The system automatically adjusts the following settings in order to optimise the
fishfinder image:
• Operatiang frequency.
• Gain modes (Gain, Color Gain, TVG)
• Power setting.
They should not ordinarily require adjustment. You can however make adjustments
manually if required.

What are the operating frequency modes?

FREQUENCY
AUTO
The DSM provides four frequency modes:
• Automatic - the system automatically selects the appropriate frequency
according to your depth. As the depth increases , the DSM changes the frequency
from 200 kHz to 50 kHz; as the depth decreases, it switches from 50 kHz to 200 kHz.
This mode is useful for automatically searching for the bottom.
• 50 KHz - scans a wide area and penetrates water well, so is good for use in deep
water.
• 200 KHz - scans a narrower area, but produces a more detailed view so is good for
finding fish that are near the bottom or close together. It is better for use in shallow
water.
• Dual frequency - Alternates pings between both 200 kHz and 50 kHz. When
Dual Frequency is selected, you must select the frequency shown (200 kHz or 50
kHz) in the active window.
How do I manually select the operating frequency?
If required, you can change the frequency to manual and then choose to either display
one frequency (single frequency mode) in all fishfinder windows or view both
frequencies simultaneously using multiple fishfinder windows.
1. Press FISHFINDER SETTINGS.
2. Press FREQUENCY and then toggle the FREQUENCY to MAN.
3. Toggle the FREQ MODE as required:
• SINGLE - toggle SELECTED FREQUENCY to either 50 kHz or 200 kHz. The
scrolling bottom is displayed using the selected frequency.
• DUAL - toggle DISPLAYED FREQ to set the frequency for the active window.
4. Press OK or CANCEL twice to return to the default display.
FREQ MODE
MAN SINGLE DUAL
SELECTED FREQ DISPLAYED FREQ
200 50 200
7-25
50