Marine inertial navigation systems (INS) determine the position, velocity, and orientation of vessels and underwater vehicles when GNSS signals are unavailable or unreliable. They enable precise navigation in challenging marine environments.
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Precise GNSS & GPS Positioning Solutions for the Toughest Marine & Maritime Environments
Advanced Inertial Navigation, Motion & Positioning Solutions for Marine Applications
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High-Performance Compact Inertial Sensing Modules for Marine & Subsea Applications
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Accurate navigation is fundamental to safe and effective marine operations, especially where satellite-based systems like GNSS/GPS are inaccessible or unreliable. Inertial navigation systems (INS) offer a robust alternative by delivering continuous positional data based on internal sensor measurements. In marine environments, on the surface or underwater, INS guides submarines, autonomous underwater vehicles (AUVs), remotely operated vehicles (ROVs), and ships through complex and signal-denied areas. Whether supporting subsea surveys, deep-sea exploration, or naval missions, marine INS enables precise navigation under the most demanding conditions.
Quanta Micro Inertial Navigation System (INS) by SBG Systems
A marine inertial navigation system (INS) is a self-contained electronic device that determines a platform’s position, orientation, and velocity by processing input from inertial sensors. These systems typically consist of accelerometers and gyroscopes that measure linear acceleration and angular rotation, respectively.
Applying Newtonian mechanics, the INS continuously calculates movement from a known starting point without relying on external signals. This makes them especially suitable for underwater or GNSS-denied environments. Marine INS units can function independently or be integrated with GNSS, Doppler velocity logs (DVLs), and other aiding sensors to enhance accuracy and correct for drift over time.
Inertial navigation systems work by measuring the linear acceleration and angular velocity of a platform. The system then uses these measurements to calculate changes in position and orientation over time. The core components include:
For marine applications, these components are typically part of a strapdown inertial navigation system, where the sensors are rigidly mounted to the platform and use algorithms to resolve position changes. Many systems use GNSS-aided or GPS-aided corrections to reduce cumulative errors, particularly in surface vessels.
INS technologies are widely deployed in a variety of marine and maritime scenarios. These include:
Certus INS by Advanced Navigation
Several types of INS are suited for marine deployment, each with varying levels of precision and endurance:
While GNSS is widely used for surface navigation, inertial navigation systems provide key advantages in scenarios where GNSS is compromised:
Marine INS accuracy depends on sensor grade, calibration, and the duration of unaided operation. High-end systems offer drift rates as low as 0.01% of distance traveled.
Marine inertial navigation systems are typically designed to interface with various maritime technologies and must meet relevant environmental, performance, and interoperability standards. These include:
INS units are often integrated into larger marine systems such as dynamic positioning suites, hydrographic survey payloads, or AUV control platforms. Integration requires robust data interfaces and time-synchronization protocols to ensure accurate system performance.
Numerous manufacturers produce INS tailored for marine environments, offering variations in performance, durability, and sensor integration. Selection depends on mission requirements, platform type, and operational constraints. Popular applications span defense, research, commercial shipping, subsea construction, and offshore energy.
Marine inertial navigation systems continue to evolve with advances in sensor technology, data fusion algorithms, and integration frameworks. These systems remain essential for accurate and reliable navigation across the world’s oceans.
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