X150 USBL Transponder Beacon

Introducing the SeaTrac X150 Micro-USBL tracking beacon. Built around a robust broadband spread spectrum signalling scheme, this multi-purpose acoustic transponder beacon is capable of simultaneously tracking up to 14 other asset positions while undertaking bi-directional data exchange.

Applications include…

  • Multi-beacon tracking system (for ROVs, AUVs, Divers etc).
  • Remote control and interrogation of sub-sea equipment
  • AUV/Diver telemetry links
  • Remote depth, attitude and orientation measurement.
SKU: OR_BPS_X150 Category:

SeaTrac Datasheet: SeaTrac_Datasheet_EN

SeaTrac User Manual: SeaTrac_Beacon_Manual

SeaTrac Developer Guide: SeaTrac_Developer_Guide

SeaTrac Connector Pinouts: SeaTrac_Connector_Pinouts

SeaTrac Firmware: SeaTrac_Firmware_v2.2


Position Tracking

When used in a tracking application, one X150 is mounted from the supervisor vessel, and connected to a PC running the SeaTrac PinPoint display and logging software. All positions are computed by the X150 beacon, so no additional PC hardware is required.

Sub-surface assets to be tracked (including Divers, ROV’s, AUV’s etc) are fitted with an X110 beacon, and optionally may use the data port to provide periodic acoustic communications with other systems and sensors.

In this mode up to 14 beacons may be tracked at ranges up to 1km from the supervisor, with the position of each being optionally broadcast to others in the network.


Data Modems

In a modem application, beacons are mounted at either end of the required data links and addressable packets of data are exchanged between the Acoustic Communication Stacks using protocols that ensure integrity of data, buffering and reattempting transmission in event of packet loss.

Use of the X150 USBL beacons will allow the interrogating end of the link to obtain a relative position of the remote modem during data exchange, while X110 beacons will provide distance between modems.

Integrated beacon sensors (such as depth, attitude and supply voltage) may also be remotely queried by the interrogating modem.



Each beacon is fitted with a 9 Degrees-of-Freedom (DOF) Attitude and Heading Reference System, taking data from the onboard MEMS gyroscope, accelerometer and magnetometer to produce pitch, roll and yaw information that is made available to external applications via the communications port.

System Integration

For OEMs, system integrators and developers the serial interfaces, ASCII based command protocol and SDK documentation allow quick integration with existing systems, providing functionality from the Application level (i.e. tracking or bi-directional data-exchange) down to individual protocols within the Acoustic Communication Stack for more specialist requirements.

To support the development and testing process, the SeaTrac Utilities software suite provides tools do monitor signal quality, perform basic acoustic operations (ping, data exchange, range and position) and remotely upgrade the beacons firmware.



Length (excluding connector)132mm (5.2″)
Length (including connector)160mm (6.3″)
Diameter55mm (2.16″)
In air708g (1.56lbs)
In fresh water508g (1.12lbs)
Depth Rating2000m (other depth rating available)
Construction316 Stainless Steel
Operating & Storage Temperature-5°C to +35°C (23°F 95°F)
ConnectorTeledyne Impulse MCBH-5-MP (5-way)
CommunicationsRS232 Main serial port (Aux serial port and RS485 operation available on request)
Supply Voltage9V to 28V DC
Power ConsumptionLess than 10W when transmitting, approx 0.5W when idle
Integrated SensorsPressure, Temperature, 9-DOF AHRS, Supply Voltage Monitor
IndicatorsRed/Green visual status LED
Remote RangingYes
Remote Positioning (USBL)Yes
Acoustic Range1km radius horizontal, 1km vertical
Range Resolution±50mm (dependant on VOS accuracy)
Angular Resolution±1°
Velocity-of-Sound Range1300ms-1 to 1700ms-1
Beacon VelocityActive Doppler compensation, up to 15kts (28kph)
CommunicationsBroadband spread spectrum encoding, 24-32kHz, 100 baud. Multi-tiered Acoustic Protocol Stack.
Packet Addressing15 unique beacon identifiers, and broadcast to all capability.
Transmit Sound Pressure Level~172dB re 1uPa @ 1m
Supported Software PlatformsSeaTrac NavPoint Software, SeaTrac Utilities Software
Developers/IntegratorsSDK, including ASCII based serial command interface with Application level and Acoustic Protocol Stack level commands for third party integration.