Furuno GP-1600F - Manual (Page 52)

3 – 2
3.2 Video Sounder Displays
The GP-1600F provides four types of video sounder displays and
two transmission frequencies. Each display and frequency has its
advantages and disadvantages. You should choose them according
to current sea area and target fish.
Normal video sounder displays
50 kHz display
The lower the transmission frequency the wider the coverage and
the longer the detecting range. The 50 kHz display, because of its
wide beamwidth, is useful for long range detection and general
sounding. It is especially useful for discerning seabed hardness;
the wider the seabed echo the harder the seabed.
200 kHz display
The narrow beamwidth of the 200 kHz transducer provides a sharp,
clear cut picture, making it perfect for detailed observation of small
fish schools. However, signal loss is higher and sounding ability is
lower than the 50 kHz transducer.
50k
132
0
40
80
120
160
58.3
CSE 180.0° SPD 16.8kt
DEP 113.6 ft TMP 16.0 °C
3D
12.0V
POS 34° 26.245' N 135° 41.232' E
200k
132
0
40
80
120
160
58.3
CSE 180.0° SPD 16.8kt
DEP 113.6 ft TMP 16.0 °C
3D
12.0V
POS 34° 26.245' N 135° 41.232' E
50 kHz 200 kHz
Figure 3-2 Comparison of 50 and 200 kHz video sounder
pictures