
USBL
solutions
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

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

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.
![]() Gaps M3
| ![]() Gaps M5 | ![]() 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 |