Ekinox2-U Underwater INS

SBG Ekinox2-U: Underwater Inertial Navigation System

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The Ekinox2-U is an INS (Inertial Navigation System) suitable for underwater use from SBG systems. The Ekinox2-U is aimed at Subsea applications and is capable of operating up to a depth of 6,000 m.



The navigation system of the Ekinox2-U utilizes an IMU (Inertial Measurement Unit) and an enhanced on-board EKF (Extended Kalman Filter). The device can be used in conjunction with several types of auxiliary equipment to provide accurate navigation that is always reliable.

With its new gyroscopes and accelerometers, the attitude accuracy of the Ekinox2 has been doubled. The Ekinox2 also boasts a Price / Performance / Size ratio that is unrivaled in the industry.

Up to 4 types of auxiliary equipment can be connected to the Ekinox2-U:

  • Heading: Magnetometer, Dual Antenna GNSS/GPS
  • Navigation: RTK GNSS/GPS
  • Velocity: Depth Sensor, DVL

This Subsea INS is simple to install, connect, and configure as it has no limitations on its mounting orientation, supports multiple Ethernet and serial ports, and sports an internal Web interface. The Ekinox2-U is available in a titanium enclosure, allowing it to operate up to a depth of 6,000m. To guarantee high data integrity in all conditions, each product is shipped with its own calibration report, showing the calibration from -20 °C to 60 °C.

The Ekinox2-U INS can be used in both Subsea and surface applications:

  1. Subsea

    This INS performs up to a depth of 6,000m and uses the latest state-of-the-art MEMS sensors to offer a highly accurate and robust underwater navigation solution in a cost-effective, compact package. The Extended Kalman Filter embedded in the unit combines real-time inertial data with additional information (GPS, DVL, etc.) for AUVs and ROV reliable navigation.

  2. Surface

    The Ekinox2-U offers delayed heave, orientation and position on four monitoring points. The sealed enclosure is perfectly suitable for marine applications such as Offshore or Hydrography. This INS is highly robust and could be mounted under your boat, or on its surface if you want to attach the motion sensor permanently. Ekinox sensors are compatible with most popular hydrographic software such as QPS, Hypack and Teledyne PDS.


  • Ekinox2 Series delivers twice the Attitude Accuracy
  • A cost-effective solution with High performance
  • Up to 4 connected auxiliary equipment
  • Easy to Set Up and Reliable for Years
  • Suitable for Surface or Subsea Applications

Technical Specifications

3D Orientation
Roll, Pitch0.02° RMSRTK GNSS aided
Heading0.05° RMSExternal Dual Antenna GNSS ( <4 m baseline)
Real-time5 cm or 5%Whichever is greater, velocity aided
Wave period0 to 20 sAuto-adjusting
Delayed2.5 cm or 2.5%Whichever is greater, velocity aided
Wave period0 to 40 s
Aiding Sensors2x GPS, DVL, Gyro-compass
Output:NMEA, ASCII, Binary, TSS, Simrad
Input:NMEA, Trimble, Novatel, Septen- trio, Hemisphere, Veripos, Fugro, PD0, PD6
Output Rate:1 to 200 Hz
Logging Capacity:8 GB ≈ 48h @ 200 Hz
Serial RS-232/422:5 serial inputs / 3 serial outputs
Ethernet:5 virtual serial ports
Position (With Split-box)
Single Point L1/L2/L5:1.2 m
SBAS:0.6 m
DGPS:0.4 m
RTK (option):1 cm + 1 ppm
RTK 30s Outage:3 mMarine conditions
RTK 60s Outage:0.2% TDMarine conditions, DVL* aided
3 mAutomotive mode – With odometer
PPK***:0.02 m
Environmental Specifications
Operating Vibrations:3 g RMS – 20 Hz to 2 kHz as per MIL-STD-810G
Depth Rating:Titanium enclosure: 200 m or 6,000 m
Operating Temperature-20 °C to 60 °C / -4 °F to 140 °F
MTBF:50,000 hours
Velocity Aided Positioning
DVL *:< 0.2% TD **External Gyro-compass or GPS Heading
Physical Characteristics
Specifications:Titanium 200 (EL)Titanium 6,000 (ED)
Depth Rating:200 m6,000 m
Weight in air:1.55 kg (3.4 lbs)2.34 kg (5.2 lbs)
Weight in water:0.86 kg (1.9 lbs)1.43 kg (3.2 lbs)
Diameter:8.7 cm (3.4 inches)9.2 cm (3.6 inches)
Height:13.8 cm (5.4 inches)15.5 cm (6.1 inches)
Power Consumption< 3 W
Supply Voltage9 to 36 VDC

* Depends on DVL performance

** TD: Travelled Distance
*** Post-processing Kinematic Typical RMS values. All specifications subject to change without notice.


The Ekinox2-U: Subsea INS from SBG Systems is available through Canal Geomatics. If you would like more information about this product, please get in touch with us by completing the Request Pricing form.