32.5Modem 6 acoustic modems are designed to wirelessly transfer sensor data from under the water to the surface at speeds between 200 and 9,000 bps. Built around our field-proven 6G hardware and Wideband 2 acoustic signal platforms, the technology found inside each acoustic Modem 6 instrument has safely transferred many gigabytes of clients’ data so whatever your application, and whatever the water depth, you can be assured of reliable communications performance.


We offer sub-surface, OEM (no housing) and surface-deployed modems to suit any operational deployment scenario and data transfer mission. You can mount them on seafloor instruments, in an AUV, suspended from a surface buoy or in the hull of an unmanned surface vehicle, and leave them for days, months or years. Uniquely, Modem 6 instruments can be upgraded to offer positioning and navigation capability (e.g. LBL and USBL positioning) if your operational needs become more complex.

Surface Deployed Acoustic Modem 6 Options

Pairs of matching Modems 6 instrument can be used to send and receive your data. However we also offer a range of dedicated surface-deployed modems which can be installed permanently through the hull of your survey vessel, over-the-side of a vessel of opportunity or in the payload of an unmanned surface platform. These are optimised for maximum physical protection, communication range and support the highest data telemetry transfer rates.


Modem 6 HPT
Offers ultimate performance. Excellent vessel noise rejection and multiple receivers ensure the highest data rates possible. Can be upgraded to a Ranger 2 USBL transceiver • Proven 11km+ range capable

• Optimised for noisy environments
• Ideal for permanent vessel fit
• Optional dunking kit

Modem 6 Dunker
A portable very rugged dunker system. Supplied with a 100m cable drum and interface unit, lower it into the water by10 metres to avoid surface or vessel interference.

• Ideal for vessels-of-opportunity
• Shock mounted electronics
• MF/LMF omni or directional transducers
• Buoy and seabed mounting option

Modem 6 USV
Boxed and sealed for integration on an Unmanned Surface Vehicle of your choice for remote data harvesting. Onboard processor allows scripts to be run on the vehicle reducing the bandwidth of
the data link / costs to shore.

• Low power electronics
• Autonomous operation
• Used on leading vehicles platforms
• Custom design service available

Modem 6 Mini (Surface Kit)  
If you’re using a pair of Minis, this accessory kit turns one of them into a lightweight dunker with protection from knocks and bumps during deployment and recovery.

• Perfect for small vessels
• RS485 comms interface
• Supplied with cable and drum
• Includes power and interface unit