Underwater Acoustic Modems

Acoustic Diver Navigation System

Communication and tracking for divers

The new EvoLogics diver navigation system facilitates map-based navigation for divers during missions, allows for waypoint setup both pre-mission and in real-time, and enables two-way communication between divers and the dive supervision team, as well as among divers themselves.

EvoLogics

Berlin, DE

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Description

About

With the new acoustic communication and tracking system for divers, EvoLogics aims to streamline complex underwater tasks such as search and rescue, salvage operations, recovery efforts, and cleanup operations. The Diver Navigation system enhances coordination, improves task management, and fosters efficient information sharing, ultimately increasing the effectiveness of diver operations.

The battery-powered diver unit is compatible with all EvoLogics 18/34 modems and USBL-Systems. It comes with mounts to attach it either on the diver’s scuba tank or to most of the common underwater scooters. The molded unibody design of the tracker ensures broad compatibility with various diving equipment and facilitates straightforward installation.

The diver console is a compact wrist tablet that connects to the modem tracker by cable. It provides the diver access to the SiNAPS user interface, visualizing the map of the current operations area, the positions of all divers and the support vessel, and running the text chat tool.
At the surface, the USBL buoy acts as the acoustic node for operations: the device is a mono-unit with a USBL antenna, an integrated PC running SiNAPS positioning software, a dual-antenna GNSS receiver, and a WiFi access point. Designed for mobile scenarios, the buoy ensures rapid setup and fully supports bidirectional diver tracking and message exchange.

The USBL buoy calculates diver positions using acoustic signals and displays them in the SiNAPS interface for the support team. This capability allows the surface team to monitor diver positions, communicate messages, and adjust mission waypoints as needed. Bidirectional acoustic links ensure that all mission divers have access to tracker positions.

The SiNAPS interface, akin to texting on a smartphone, enables divers to exchange short messages with each other and the surface team while tracking each other's positions in real-time. Mission waypoints can be added before or during the mission to coordinate operations and mark discovered objects or infrastructure for further investigation.

SPECIFICATIONS:

• encrypted acoustic communication, range up to 1.5 km, acoustic frequency 18-34 kHz

• positioning in absolute geocoordinates, slant range accuracy +/- 10 cm

• battery duration up to 8 hours

• max. depth rating 50 m

• simultaneous tracking of up to 5 divers

• messaging to/from up to 100 divers

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Specifications

Physical Properties: Weight in air [kg]

2

Operating properties: Depth rating {m}

50

Maximum range (sea/fresh water)

up to 1500 m

Stand-by mode

Y

General: Area of Application

Diver communication

Field of Use

Diving operations

Year of latest version

2024

Acoustic properties: Acoustics date rate

up to 13.9 kbit/s

Beam width

360

Error rate

less than 10-¹⁰

Max. Operating frequency [kHz]

34

Min. Operating frequency [kHz]

18

Transducer beam shape

horizontally omnidirectional