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USBL
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With systems deployed worldwide, the Gaps Series high-accuracy USBL acoustic positioning and communication systems have become a trusted solution for users across the globe. Renowned for its unparalleled horizontal tracking capabilities and exceptional performance from ultra-shallow waters to depths of 7,000 meters, the Gaps Series supports diverse applications, including diver tracking, work-class ROV surveys, AUV missions, and even the most demanding dynamic positioning operations.

Powering ultra-performance subsea positioning and communication

Gaps situation

Unmatched positioning accuracy

The Gaps Series delivers unparalleled subsea positioning accuracy (≥ 0.06% CEP50) in diverse and challenging environments. Its unique design integrates a high-performance ultra-short baseline (USBL) with FOG-based and MEMS motion sensors in a single housing.

True horizontal tracking

The Gaps Series, with its embedded gyroscope and 3D omnidirectional acoustic antenna, offers 200° acoustic aperture and true horizontal tracking without the need to tilt the antenna. It operates flawlessly from shallow waters to depths of 7,000 meters, ideal for 360° tracking of multiple ROVs and AUVs.

Complementing the series, Exail Posidonia offers ultra-precise, long-range tracking of subsea vehicles beyond 10,000 meters.



Learn more about Posidonia
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Next-generation Gaps USBL:
Extended range, telemetry, new MMI

Our next-generation Gaps USBL offers new powerful capabilities, including low-frequency tracking up to 7,000 meters, enhanced acoustic telemetry, and a modern, user-friendly Man-Machine Interface (MMI). Unlock the full potential of your subsea operations with advanced performance and seamless integration.


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Encart gaps

A versatile and easy-to-use system

A scalable range for every operational need

The Gaps Series provides a versatile suite of solutions designed to meet the diverse demands of modern maritime operations. With three distinct models, the series is tailored to deliver precision and reliability across a wide range of applications:

  • Flexible deployment: Temporary or permanent setups, integration with vessels, USVs, or static installations.
  • Extended-range options: Depths of up to 7,000 meters for demanding missions.
  • Broad applications: Ideal for diver tracking, work-class ROV surveys, AUV missions, and dynamic positioning tasks.
Exail produits gaps m3

Gaps M3

Exail produits gaps m5

Gaps M5

Exail produits gaps m7

Gaps M7

Pre-calibrated

No

Yes

Yes

Operating range

995/7,000m*

995/7,000m*

4,000/7,000m*

Absolute accuracy (% of slant range CEP50)

0.2%

0.06%

Acoustic repeatability (% of slant range)

0,1%

0.1%

0.06 %

Embedded motion sensor

Octans Nano FOG-based AHRS

Phins FOG-based INS

Heading accuracy

0.15° secant lat (RMS)

0.01° secant lat (RMS)

Dimensions (height x diameter)

465mm x 296mm

520mm x 296mm

638mm x 296mm

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A wide spectrum of applications