GME G142CFD - Manual (Page 20)

G - C O M B O I N S T R U C T I O N M A N UA L PA G E 2 1
3-5-3 Single and Dual frequency fish finding
Sonar frequencies
The G142CFD is a dual frequency unit, using 200 kHz and 50
kHz to detect various bottom conditions at various depths.
To select the sonar frequency in sonar window:
1 Press MENU, select Frequency.
2 Select Frequency and press ENT
3 Press ESC to exit.
High frequency (200 kHz )
The higher ultrasonic signal, the better the resolution. For this
reason the 200 kHz frequency is ideal for detailed observation
of fish schools.
Low frequency (50 kHz)
The lower frequency signal is a signal for a wider detection
area. Therefore, the 50 kHz frequency is useful for general
detection and judging bottom conditions.
Mixed frequencies (200 kHz / 50 kHz)
The Mixed frequency combines the 200 kHz and the 50 kHz in
the Sonar window.
Note: The 50 kHz signal will travel deeper than the
200 kHz signal.
The display is useful for comparing the same picture with two
different frequencies.
3-5-4 Range
Range is the depth of water displayed on the sonar window.
The basic range may be chosen in auto or manual mode.
Auto: When the mode is set to auto, the unit adjusts the
depth automatically for the best performance. This option is
recommended for normal operation.
Manual: When the mode is set to manual, the unit only
displays the depth of water at a chosen range. This could
mean that the sea bed is not displayed as it is out of range.
To set the manual mode in the sonar window:
1 Press MENU, select Range.
2 Select a mode you want and press ENT.
3 If you select the manual mode, press + or - to change
value of max displayed depth.
When the set depth is too low
When the set depth is too high
High Frequency (200 kHz)
Low Frequency (50 kHz)