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SART S.701
SeaTraceR AIS B
AIS Identifier
S.715 SkyTraceR


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The S.701 Search & Rescue Transponder (SART) from SevenStar Electronics Limited has been designed to fulfil and exceed the requirements of X-band Marine Search & Rescue Radar Transponders as specified for use within the GMDSS community. It has been designed and built using the most modern components available, and offers several features which give it significant advantages over earlier generation SARTs. 

It has been Type Approved to both the FCC and EU MED requirements and carries the 'Wheelmark' symbol. It was specifically designed with life-raft fitment in mind, as well as conventional 'carry-off' use. It is capable of auto activation in liferaft installations, and is one of the smallest and lightest SARTs available today. Its exceptionally low power consumption made it the first SART that could be shipped globally as NON-HAZARDOUS goods (*check with Sartech for latest shipping regulations). And its unique digital design brings new levels of sophistication, with reduced component count and increased reliability.

The 12 dots in the picture are the clearly recognisable SART radar response:


Two models are currently available. The
S.701-C/O model is the full Carry-Off version, with mounting bracket, tether, and straps. It can be fixed to any convenient bulkhead or wall. The S.701-L/R is the liferaft version, supplied on its own to make the most of its ultra-slim profile and stow easily inside the raft. It can also be arranged to activate automatically as the raft inflates. An optional 1 meter telescopic mounting pole is also available.

The S.701 SART is the result of many years experience in the specification, design, manufacture and use of SARTs and related marine safety equipment. It brings together the ultimate in high-reliability design, modern manufacturing techniques and 'designed-in' ease of deployment. It produces an instantly recognizable “12 dot” radar return to alert and then direct rescue vessels to the survivors. 

More about SARTs:

Search And Rescue Transponders (SARTs) are mandatory carriage safety devices that form part of the Global Maritime Distress And Safety System (GMDSS). SARTs are active radar transponders, and operate exclusively in the 'X-band' part of the radio spectrum, receiving and transmitting at nominally 9,200 MHz to 9,500 MHz.

They are deployed during maritime emergencies as an aid to rapidly locating survivors who may be adrift in a life raft. Many studies have shown that rescue time is absolutely critical in minimising loss of life after abandoning ship. The conditions aboard a liferaft can be unpleasant and disorienting!

Once activated, a SART ‘listens’ for an incoming radar signal from a passing vessel – note that this can be from ANY vessel or aircraft equipped with a standard X-band radar set, and is not restricted to specific Search & Rescue craft.

When the SART receives a valid signal, it switches into Transmit mode, and responds to each valid signal by transmitting a series of twelve (12) sweeps through the band 9,200 to 9,500 MHz, each transmission lasting just over 100 microseconds in total. This signal is seen on the passing vessel’s or aircraft's radar screen as a line of twelve dots, with the SART position being given by the closest dot. This is a clear, unmistakable, Internationally recognized signal, and shows the presence AND location of a vessel, survivor or life raft with an active SART.


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SevenStar's combination of extensive market knowledge, state-of-the-art microwave design and highly relevant manufacturing experience has produced a new generation of SART that delivers the following key benefits:

  • Physically small and light (only 40mm thick, and 385g weight)  

  • The first SART to be shipped as NON-HAZARDOUS goods! (*check with Sartech for latest shipping regulations)

  • Easy to carry-off and deploy (easy shape to hold, light)

  • Easy to install permanently in liferafts (smooth, very low profile)

  • Capable of automatic activation as liferaft deploys

  • Has electronics that are sealed for life, with no adjustable parts

  • Has a field-changeable battery pack

  • Uses digital technology to guarantee lifetime performance


It is one of the smallest and lightest SARTs so far, and it was the first SART that could be shipped as NON-HAZARDOUS goods* - this makes it a lot easier and cheaper to arrange shipments anywhere in the world since the change in carriage legislation in Jan 2003. It's small size and efficient packaging further reduces shipping costs - a single liferaft model in its carton takes up less than 0.5kg 'volumetric weight'! (*please check with Sartech for latest shipping regulations)

All the primary parameters are set and stored digitally within the S.701 SART, ensuring that its performance will NOT 'drift off' over time as with conventional analogue designs.

It has been designed to be equally applicable to the ‘Carry-Off’ SART market AND to the new liferaft-mounted requirements. (From July 2004, one in four liferafts on Ro-Ro ferries HAS to fit a SART. It obviously makes more sense for ALL the liferafts to fit one.) Its sleek appearance also makes it an attractive and highly effective safety addition for both yachts and power cruisers.

And it can be delivered to market at a price where it is cheaper to buy a new SevenStar SART than it is to replace the battery pack on many older units! 






Replacement battery pack:

The battery pack on the S.701 SevenStar SART should be changed every 5 years, or if the unit has been accidentally damaged or activated (a brief period is allowed periodically for annual testing.) The S.701 was the first SART that can be shipped as non-hazardous goods*, and the replacement battery pack was also able to be shipped as non-hazardous goods for many years*. (*Please check with Sartech for the latest shipping regulations)

The S.701B replacement battery pack kit is available from our distributors, and is capable of being fitted by a competent service engineer with only a 2.5mm hex driver. The kit includes a new gasket, screw and O-ring, as shown in the photo.

The S.701 from SevenStar is also unique in that the SART electronics remain totally sealed during battery pack removal and refitting - it is impossible to damage or de-tune the electronics, or allow the accidental ingress of moisture.


S.701B Replacement Battery Pack


All information © SevenStar Electronics Ltd 2002-18