Raymarine Marine RADAR - Manual (Page 19)

See the 'Using the Fishfinder' chapter of the Reference Manual.
D6735_5
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
Dark layers indicate strong signals; lighter layers weaker signals.
A thin line indicates a hard
bottom (sand)
How do I interpret the bottom?
Peaks and troughs, indicate an
uneven or rocky bottom or a wreck A wide line indicates a soft
bottom (mud or seaweed cover)
What can I see on the screen?
68
69
50
ADJUST P1
SINGLE...
PRESET 2
DUAL
PRESET 3
SHALLOW
PRESET 4
DEEP
PRESENTATION...
F1: 200 kHz
Freq1: 200KHz-Auto
Depth
markers
Target
Bottom
Bottom of
transducer
Frequency
Frequency modes
Target
depth
Bottom
depth
SINGLE Freq2: None
Transducer Mode
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's under the boat?
Understanding the fishfinder
Card 18
Adjust P1
SINGLE
PRESET 2
DUAL
PRESET 3
SHALLOW
PRESET 4
DEEP
PRESENTATION
?
More information...