Raymarine L750 Operations Instructions download pdf (Page 51)

Chapter 3: Operating Instructions

50 kHz frequency

When using this frequency, the transducer can scan a wide area.

The 50 kHz signal penetrates water well, so it is good for use in

deep water.

200 kHz frequency

When using this frequency, the transducer scans a narrower area,

but produces a more detailed view. The 200 kHz frequency is good

for seeing fish which are near the bottom or are close together. The

200 kHz setting is better for use in very shallow water.

“Dual” frequency

These settings use both the 50 kHz and 200 kHz signals at the

same time. This allows for some of the advantages of both

frequencies. The dual settings produce good depth penetration

and good detail in the display. Using the “Dual 50 kHz” setting, the

display is produced using the signal from the 50 kHz beam, with

additional information from the 200 kHz beam. Using the “Dual 200

kHz” setting, the display is produced using the signal from the 200

kHz beam, with additional information from the 50 kHz beam.

Display

from 200 kHz

beam

Display

from 50 kHz

beam

Fig. 3-9 Split Frequency Feature

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Raymarine L750 Operations Instructions Page 51