Overview
HydroScan towfish produce photo-like images of the bed on both sides of the survey line. They switch between CW and CHIRP pulses on two frequencies at once, so you get a long-range overview and a high-resolution image in the same pass. Three models are available: the 1400 for long range, the 4900 for high detail, and the compact 900P for shallow work from small boats and USVs.
Key features
- Three models: 1400 (100/400 kHz), 4900 (400/900 kHz), 900P (900 kHz)
- Across-track resolution 1.25 cm
- Range up to 450 m (100 kHz)
- 316 stainless steel towfish rated to 1000 m
- Internal heading, attitude and pressure sensors
- XTF output, meets IHO and NOAA standards
Technical specifications
Source: SatLab Geosolutions published specifications. Figures can change between product versions; we confirm them in every quotation.
Models
| HydroScan 1400 | 100 kHz and 400 kHz |
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| HydroScan 4900 | 400 kHz and 900 kHz |
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| HydroScan 900P | 900 kHz, compact aluminium body |
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Sonar
| Signal | CW and LFM (CHIRP) |
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| Horizontal beam angle | 0.6° at 100 kHz; 0.2° at 400 kHz; 0.2° to 0.3° at 900 kHz |
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| Vertical beam angle | 45° |
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| Across-track resolution | 1.25 cm |
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| Maximum range | 1400: 450 m at 100 kHz, 150 m at 400 kHz; 4900: 150 m at 400 kHz, 75 m at 900 kHz; 900P: 45 m |
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| Tow speed | 2 to 6 knots |
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Towfish
| Depth rating | 1000 m (1400, 4900); 300 m (900P) |
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| Size | 1400: Ø105 × 1300 mm; 4900: Ø105 × 1170 mm; 900P: 637 × 105 mm |
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| Weight | 30 kg / 26 kg (stainless steel); 6 kg (aluminium) |
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| Internal sensors | Attitude, heading, pressure, depth (1400, 4900) |
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| Cable | Kevlar, 50 m standard (250 m optional) |
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| Power | Max 40 W / 30 W / 15 W |
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Software
| Acquisition | SLHydro SSS (Windows) |
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| Input / output | NMEA 0183 in; XTF out |
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Source: manufacturer's published datasheet. Values are measured under the manufacturer's test conditions and may change without notice.