Raymarine Marine RADAR manual Understanding the fishfinder, Whats under the boat?

Page 19

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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Contents
What can I see? What is around me?Where am I going? General OperationControl panel General OperationAlways keep a proper look-out Cursor appears on the screen as a white cross Using the controlsHow do the controls work? ExampleHow do I select a Page? Setting up the displayHow do I select how the applications are displayed? How do I select the Page Set?With the unit powered How do I find where I am on the chart? Understanding the chartWhat can I use the chart for? How do I move around the chart?How do I change how my boat moves on the chart? Using the chartViewing detail on the chart How do I change the chart orientation?Viewing object information Finding nearby features and servicesDisplaying port services Displaying additional informationHow do I display pilot book information? How do I display a panoramic photo?How do I display aerial photo overlay? Changing the view on the 3D chart Understanding the 3D chartWhat can I use the 3D chart for? How do I move around the 3D chart?How do I change the motion mode? Using the 3D chartHow do I find where I am on the 3D chart? Synchronize 3D chart with 2D chartWorking with Waypoints Basic NavigationHow do I build a route by placing waypoints on screen? What is a route?How do I follow a route? Understanding the radar What is around me?What does the radar show me? What does a guard zone display? How do I set up a circular guard zone?Avoiding a collision How can the radar help me avoid a collision?Using Marpa Using AIS 0ff course On courseHow do I interpret the bottom? Understanding the fishfinderWhats under the boat? What can I see on the screen?How do I change the range or shift the image? Using the fishfinderHow do I change Presets? Whats under the boat?How do I monitor the engines? Engine monitor application enables you toMonitoring data and engines Viewing video images How do I monitor data?Highlight and select Navtex messages Navtex and Sirius Weather DataNavtex Sirius Weather application USA onlySirius Weather Data Weather symbols USA onlyStorm Tracks symbols Wind speed symbols knotsHow do I disengage the Autopilot in an emergency? Using the Autopilot controlsWhat are the Autopilot symbols? Autopilot OperationChange value to suit How do I change the radar gain settings?Understanding the digital radar What do the digital radar colors show me?How is the network controlled? What does a networked system do?How do I change the master display?