Gyro-stabilization of the Imagenex Model 881L-GS makes the high resolution 881L sonar into a system capable of crystal clear visualization of the ocean environment from moving platforms, no longer compromised by the blurring effects of host vehicle rotation. An advanced, low drift gyro is integrated directly into the sonar head, so the sonar can now compensate for vehicle motion in real time with unprecedented accuracy, stability, and robustness.

The enhanced capabilities of the 881L-GS have not compromised the performance of the 881L sonar. Using Ethernet communications, this all-in-one, high performance digital imaging sonar can still exceed 100 shots per second on short range at up to 2 mm range resolution, and can auto-adjust acoustic frequency and resolution to scan up to a 200 m radius, 360° surrounding area.

The Model 881L-GS still has low power, simple set-up, and small size that make it an ideal tool for large work ROV’s and small inspection vehicles. On it’s own it is now an amazingly simple drop sonar and borehole inspection package: just add a laptop computer and power supply and run the included Imagenex software.


Underwater Hardware Specifications


310 kHz, 675 kHz, or 1 MHz (standard default settings)
-Other frequencies can be selected through programmable software configurations
(Tunable from 280 kHz to 1.1 MHz in 5 kHz steps)


Imaging type, fluid compensated

Transducer Beam Width

310 kHz:  4° x 40°
675 kHz:  1.8° x 20°
1 MHz:  0.9° x 10°

Range Resolution

1 m - 4 m:  2 mm (0.08")
5 m & up:  10 mm (0.4")

Orientation Module (accuracies)

Pitch & Roll:  ± 0.1° typical
Heading (Magnetic):  ± 1.0° typical

Min. Detectable Range

150 mm (6")

Max. Operating Depth

1000 m and 3000 m available

Max. Cable Length

Standard:  100 m on CAT5e
Cable length may be increased up to ~9000 m using an Ethernet extender.  Please enquire for more information.


Standard:  10 Mbps Ethernet (10 BASE-T) using TCP/IP
Bit rate may vary if an Ethernet extender is in use.


Side mounted, eight conductor, wet mateable (Subconn MCBH8M-AS)
Optional right angle or end mount connector

Power Supply

20 - 32 VDC at less than 7 Watts


(For Both depth ratings)
79.5 mm (3.13”) diameter x 245.7 mm (9.68”) length

Weight in Air

1000 m unit:  1.8 kg (4 lbs)
3000 m unit:  TBA

Weight in Water

1000 m unit:  TBA
3000 m unit:  TBA


1000 m unit:  6061-T6 Aluminum & Polyurethane
3000 m unit:  Titanium, Polyurethane & 300 series stainless steel                   


Hard Anodize

Software Specifications



Windows™ Operating System

Windows™ XP, Vista, 7, 8, 10


Sector, Polar and Side Scan

Gyro Modes

North Up, Heading Up, Target Steering

Range Scales

1 m, 2 m, 3 m, 4 m, 5 m, 10 m, 20 m, 30 m, 40 m, 50 m, 60 m, 80 m, 100 m, 150 m, 200 m

Train Angles

Continuous rotation, 3° increments

Sector Size

Sector Mode:  0° – 180°, 3° increments
Polar Mode:  0° – 357°, 3° increments, or Continuous rotation

Step Sizes

Slow (0.3°), Medium (0.6°), Fast (0.9°), Faster (1.2°), Fastest (2.4°)

Grid Types

Polar and rectangular

File Format


Recommended Minimum Computer Requirements

2 GHz Pentium 4
256 MB RAM
20 GB Hard Disk
1024 x 768 Screen Resolution

Ordering Information

1000 m Unit


3000 m Unit


End Mount Connector

Option               -009

Right Angle Connector

Option               -010

IP Address*

Option               -020
*Note:   Standard IP Address is
            A different IP Address may be specified upon ordering.

Gyro Stabilization

Option               -048



  • Ethernet
  • Programmable (format available)
  • Gyro stabilized transducer steering
  • Simple set-up and installation
  • Full scale range from 1 m to 200 m
  • Orientation module


  • ROV, AUV, & UUV
  • Manned Submersibles
  • Search & Recovery
  • Borehole/cave work
  • Drop sonar
  • Scientific Research

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