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7 Star Products

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.

7 Star S701

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 also has Greek, Indian and Ukraine certification. It has been 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 makes it the first SART that can be shipped globally as NON-HAZARDOUS goods - making it much simpler, quicker and cheaper to ship and stock. And its unique digital design brings new levels of sophistication, with reduced component count and increased reliability.

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 direct rescue vessels.

7 Star Unique Features

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 that can be shipped as NON-HAZARDOUS goods!
  • 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, NON-HAZARDOUS battery
  • Uses digital technology to guarantee lifetime performanceI

IIt is one of the smallest and lightest SARTs so far, and it is the first SART that can 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'!

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.

Jotron- Tron sart

GMDSS 9 GHz Radar Transponder

For use in lifeboats and life rafts.
Easy mounting on vessel bulkheads. Optional brackets are available.

Complies with IMO/SOLAS/GMDSS regulations.

MED and FCC approved.
NATO Stock No. 5895-25-145-1727



- Tron AIS-SART gives the exact location, with GPS precision
- Position update - every minute

- Adopted by IMO RES MSC. 256 (84) as an alternative to 9GHz SART

Proved performance:
- Up to 10 nm from a SOLAS ship with AIS class A transponder
- Up to 40 nm from a SAR helicopter (altitude 1000 ft)
- Up to 130 nm from a SAR aircraft (altitude 20000 ft)

- AIS technology contribute more effective, less time consuming SAR operation, due to superior position accuracy
- The AIS-SART is detected on both AIS Class A and B and AIS Receivers
- Small and compact
- Jotron Tron AIS-SART use the same acessories as the Tron SART20 Bulkhead
bracket, pole, life-boat bracket and neoprene protection bag)

Will be shown on ECDIS or Chart plotters as a RED Circle with a cross inside.


Jotron Sart20


- Designed for use in search and rescue operations
- Gives the exact location of the distressed on the radar X-band display
- 5 years warranty
- New non-haz battery
- Unique range of accessories
- Incorporated into Jotron recycle program

Complies with IMO/SOLAS/GMDSS regulations.
MED and FCC approved.
Also with IMO MSC.247(83) and MSC.256(84)



Following brackets are available for Tron AIS-SART and Tron SART20

82746 Wall bracket is included with main unit

84065 Lifeboat bracket

82900 Pole Bracket



Sailor Sart

9 GHz Search and Rescue Transponder

The SAILOR SART II is small and easy to use, offering safety in critical situations. The SAILOR SART II is a 9 GHz X-band Radar transceiver and has been designed for assisting rescue operations in accordance with IMO, GMDSS requirements.

When a radar signal is received from a vessel or aircraft, the SAILOR SART II automatically transmits a response signal, which clearly identifies the survival craft on the radar screen by means of a stream of 12 in-line dots. Once activated, the SAILOR SART II will remain in standby mode for over 96 hours.


  • Ship or survival craft options
  • Waterproof to 10 m
  • Maintenance free
  • Replaceable, 5 year battery pack
  • Audio/visual indication of operation
  • Built-in test facility
  • Integral lanyard
  • Mounting options – internal/external

9 GHz Search and Rescue Radar Transponder


  • Complied with related IMO/GMDSS requirements
  • Designed for reliable operation in the roughest of marine evironments
  • Lightweight and rugged construction is suitable for placing at liferafts.
  • Complete set with a liferaft mounting kit
  • Efficiently assisting ship or survival craft rescue operations


    Frequency : 9.2 ~9.5 GHz
    Polarization : Horizontal
    Vertical beam width : +12.5 Degrees
    Azimuthal beam width : Omnidirectional to ±2dB
    Radiated power : > 400mW (+26dBm)
    Form of sweep : Sawtooth(12 sweeps)
    Pulse emission : < 100㎲
    Forward sweep time : 7.5㎲ ± 1㎲
    Return sweep time : 0.4㎲ ± 0.1㎲
    Recovery time : < 10㎲
    Response time : < 0.5㎲
    Effective sensitivity : better than -50dBm
    Duration of operation : 96 hours in standby condition followed by a minimum 8 hours of transmissin while being
    continuously interrograted by an X-band radar with a pulse repetition frequency of 1KHz at extreme temperatures
    Battery life : 5 years
    Temperature range : Operating -20℃ to 55℃, Storage -30℃ to 65℃

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