Sonardyne revolutionises small marine robotics navigation with launch of SPRINT-Nav U

Sonardyne International Ltd announces the launch of SPRINT-Nav U, the world's smallest hybrid acoustic-inertial navigator designed specifically for compact marine robotic platforms.

This groundbreaking technology delivers the proven performance of Sonardyne's industry-leading SPRINT-Nav family in a package measuring just 135 mm tall by 114 mm in diameter and weighing only 600 grams in water.

SPRINT-Nav U represents a significant advancement for operators of small ROVs, AUVs, towfish, and USVs, who can now access survey-grade navigation capabilities previously available only to larger platforms. The system combines four critical instruments—AHRS, DVL, INS, and pressure sensor—into a single unit with one connector and one cable, dramatically simplifying integration while optimising size, weight, and power consumption.

Aidan Thorn, Business Development Manager – Marine Robotics, Sonardyne said:

"SPRINT-Nav U transforms what's possible for small robotic platforms. Operators can now conduct complex inspections and surveys around offshore structures, ports, and harbours with exceptional accuracy and reliability, without the need for large-scale vessel deployments." 

Key features and benefits

• Ultra-compact design: Measuring 135 mm x114 mm and weighing only 0.6 kg in water (1.98 kg in air), SPRINT-Nav U fits into spaces traditionally occupied by just a DVL
• True north seeking: Maintains accurate heading even in ferrous environments where MEMS-based navigation systems struggle
• Survey-grade performance: Delivers 0.1% error for distance travelled during typical surveys, with heading accuracy of 0.15°
• Extended altitude range: 500 kHz DVL maintains bottom lock at up to 100 m altitude
• Rapid deployment: Aligns in just 5 minutes with DVL bottom lock
• Easy operation: Familiar web user interface shared with SPRINT-Nav Mini, with outputs compatible with third-party software

Game-changing capabilities for offshore energy

SPRINT-Nav U is particularly valuable for offshore wind operations, where its compact FOG-based IMU provides continuous, high-accuracy position, orientation, and velocity data even when operating in and around steel structures. This capability enables operators to conduct thorough inspections of wind turbine foundations, cables, and other subsea infrastructure without the interference issues common to magnetic-based systems.

John Houlder, Senior Product Manager, Sonardyne said:

"The ability to maintain accurate navigation in and around ferrous structures is a game-changer for operations such as offshore wind farm monitoring and maintenance. SPRINT-Nav U ensures operators can collect consistent, high-quality data near steel components where other systems would fail."