Name: USBL Underwater Positioning System MKIII
Brand: Cerulean
SKU: 9601
Availability: InStock

USBL (Ultra-Short Baseline) Underwater Positioning System MKIII

Product Introduction

Flagship Performance | Zero Drift | Unlimited Subsea Tracking Expert

The pinnacle of professional underwater positioning, engineered for long-endurance deep-sea missions. The ROV Locator Mk III redefines ease of use compared to the Mk II, featuring a $300\text{m}$ depth rating and advanced acoustic synchronization. Powered by the free SonarView software, it offers "out-of-the-box" real-time tracking and open API integration for custom software environments.

● Core Advantages：
Zero Time-Base Drift: Unlike the Mk II, the Mk III requires no initial time synchronization. It can remain submerged indefinitely without any loss in slant range accuracy.
Deep-Sea Ready: $300\text{m}$ depth rating to handle more demanding and distant underwater tasks.
Streamlined Integration: Integrated easily via ROV power. It also supports an independent battery backup, ensuring continuous tracking even in the event of an ROV main power failure.
Multi-Platform Support: Communication with the surface unit via USB; supports Mavlink protocol, allowing SonarView to update and synchronize data to the ground control station (GCS) in real-time.
Open Ecosystem: Comprehensive Open API interface provided (refer to the User Manual).

USBL Underwater Positioning – Real-Time Coordinate Tracking

● Operating Principle：
The Mk III utilizes an "Interrogator-Transponder" (Acoustic Duplex) mode, calculating slant range through Time-of-Flight (ToF). This duplex communication mechanism eliminates the need for satellite time-sync required by the Mk II, ensuring long-term positioning stability.

● Packing List：
Subsea Unit ( $300\text{m}$ Depth Rating) * 1
Surface Unit * 1
Specialized Mounting Bracket * 1
SonarView Software (Free Download)
Open API Development Manual * 1

USBL (Ultra-Short Baseline) Underwater Positioning System MKII

Product Comparison Table

	ROV Locator Ⅱ	ROV Locator Ⅲ
Sync Technology	GNSS Satellite Sync	Acoustic Duplex Sync
Positioning Principle	Calculates time difference based on pre-aligned clocks at both ends.	Calculates two-way Time of Flight (ToF) of acoustic signals.
Pre-Dive Prep	GPS signal acquisition required at the surface before diving.	No sync required; true plug-and-play upon power-up.
Accuracy Stability	Subject to clock drift (approx 1 m/h).	Zero drift; accuracy remains constant over time.
Mission Duration	Requires periodic recovery to the surface for re-sync.	Supports unlimited underwater operation time.
System Integration	High; requires clear line-of-sight for GNSS antennas.	Ultra-high; simpler installation with a more compact form factor.
Multi-Device Compatibility	Minimal restrictions.	Limited to one system per area.
Ideal Scenarios	Short-duration, budget-friendly routine missions.	Long-endurance deep-sea missions and professional scientific research.

Technical Specifications：Cerulean Sonar MK Ⅲ USBL

Category	Parameter	Surface Unit（Transceiver）	Subsea Unit（Transponder）
Physical	Depth Rating	50 m	300 m
	Volume	480 ml	400 ml
	Mass in Air	600 g	300 g
	Mass in Water	-120 g（Positive Buoyancy）	-100 g（Positive Buoyancy）
Performance	Pulse Frequency	25 kHz	25 kHz
	Yaw/Azimuth Resolution	0.1°	--
	Elevation Resolution	0.1°	--
	Slant Range Resolution	0.1 m	--
Electrical	Input Voltage	5 V-28 V	5 V-28 V
Installation	Included Accessories	Mounting brackets，clamps	Mounting brackets，clamps