Onwa KF-667 User Manual download pdf (Page 13)

2.3.2 Display mode description

200K, 50K (high frequency, low frequency) mode

The sounder uses ultrasonic pulses to detect bottom conditions. The lower the frequency of

the pulse the wider the detection area. Therefore, the 50KHz frequency is useful for general

detection and judging bottom conditions, while the 200KHz frequency is useful for detailed

observation of fish schools.

DUAL frequency mode

This mode provides the 50KHz picture on the left-half of the screen and the 200KHz on the right

half, and is useful for detecting fish schools which have different reflection characteristics with

frequency. For example, a school of tiny fish like minnow returns stronger echoes on a high

frequency compared to a low frequency.

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Onwa KF-667 User Manual Page 13