What's under the boat?

Understanding the fishfinder

Card 18

Adjust P1

 

PRESET

2

 

PRESET 3

 

PRESET 4

 

PRESENTATION

 

 

 

 

SINGLE

 

DUAL

 

 

SHALLOW

 

DEEP

 

 

 

 

 

 

 

 

 

 

 

 

What's under the boat?

The fishfinder application, when connected to a suitable Digital Sounder Module (DSM) and transducer, will help you to see fish, bottom structure and underwater obstructions. The image scrolls from right to left at an automatically selected range and frequency to provide a record of the echoes seen. You can mark with a waypoint any positions of interest that you may wish to return to. These waypoints are added to the waypoint list and can be used by other applications.

What can I see on the screen?

Transducer Mode

SINGLE

Frequency F1: 200 kHz

Bottom

ADJUST P1

SINGLE...

Frequency modes

Freq1: 200KHz-Auto

Freq2: None

 

 

 

Bottom of

 

 

 

 

 

 

transducer

 

 

 

Depth

 

 

 

 

 

 

markers

 

 

50

 

 

 

 

Target

 

 

 

 

 

 

 

 

 

 

 

 

 

depth

 

 

 

 

68

 

Target

 

 

 

69

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bottom

 

 

 

 

 

 

 

 

 

 

 

 

 

 

depth

PRESET 2

PRESET 3

PRESET 4

PRESENTATION...

 

DUAL

SHALLOW

DEEP

 

 

 

 

 

How do I interpret the bottom?

A thin line indicates a hard

 

A wide line indicates a soft

 

Peaks and troughs, indicate an

bottom (sand)

 

bottom (mud or seaweed cover)

 

uneven or rocky bottom or a wreck

 

 

 

 

 

Dark layers indicate strong signals; lighter layers weaker signals.

What influences target display?

The shape and size of echoes indicating targets, is influenced by a combination of:

 

Boat speed - flatter at slower speeds

Transducer frequency - broader at lower frequencies

 

Target depth - larger near the surface

Target size - larger targets return larger echoes

 

 

 

 

 

? More information... See the 'Using the Fishfinder' chapter of the Reference Manual.

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Raymarine Marine RADAR manual Understanding the fishfinder, Whats under the boat?, What can I see on the screen?

Marine RADAR specifications

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