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Bottom
60
Marker-zoom display
This mode expands selected area of the nor- mal picture to full vertical size of the screen on the
49.6
80
Figure 1-7 Typical 50 kHz display
High frequency (200 kHz) display
The higher the frequency of the ultrasonic pulse the better the resolution. Therefore, the 200 kHz frequency is ideal for detailed ob- servation of fish schools.
Dual-frequency display
15
20
Zoomed fish school
25
28.2
0 |
10 |
14.7 |
Fish |
school |
20 |
30 |
Normal display
Variable range marker (green)
This section is zoomed
The 50 kHz picture appears on the left; the 200 kHz picture on the right. This display is useful for comparing the same picture with two different transmitting frequencies.
0 | 50/200 | 0 |
0.0 | ||
50 kHz | 200 kHz |
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picture | picture |
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40 |
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60 |
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49.6 |
| 80 |
Figure 1-8 Dual-frequency display
Zoom marker
Figure 1-9 Marker-zoom display
plus normal display
Note : The zoom marker looks like white when the background is blue.
4
