Validated in real sea conditions

Many suppliers tend to present test data solely for simple regular sine motions. Unfortunately, vessels experience irregular and coupled motions at sea. While most sensors perform well in sine wave motion, only a select few excel in irregular motions at sea. Our Motion Reference Units stand out as they consistently deliver exceptional performance across all conditions.

Irregular motion profile with significant amplitude of 5 degrees and peak period of 10 seconds.

The test starts and stops with the MRU in the horizontal position (0 degrees).

The roll and pitch RMS error is calculated over the entire test duration of 350 seconds.

The Heave test has an irregular motion profile with a significant amplitude of 0.5 m and peak period of 7 seconds. The Heave filter uses automatic estimation of significant amplitude and peak period to optimize the performance.

The Heave RMS error is calculated over the entire test duration of 250 seconds, with very accurate results.

For reference, an MRU from another brand, with comparable Heave accuracy specifications, was included in the tests. This MRU performed well in sine waves, but in real sea conditions, it was unable to provide useful results.

Norwegian Subsea produces industry-leading Motion Reference Units (MRUs) for subsea, marine, and land applications. Our MRUs are robust and affordable, and offer high-accuracy performance, along with a plug-and-play interface.

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