SafeSea S100 Radar SART

The Ocean Signal SafeSea S100 Radar Search and Rescue Transponder or Radar SART is a critical component of maritime safety equipment, designed to enhance visibility and aid in search and rescue operations. With its advanced radar reflector technology, this beacon ensures your vessel is easily detectable even in adverse weather conditions and low visibility situations. Compact and durable, the S100 Radar SART is easy to deploy and highly reliable, offering peace of mind for sailors and boaters alike. Whether navigating busy shipping lanes or sailing in remote waters, the Ocean Signal SafeSea S100 Radar SART is an essential addition to any vessel’s safety gear, ensuring swift and effective response in emergency situations.

The SeaSafe S100 SART is designed to assist in the rescue and recovery of liferafts and survival craft. When switched on, the SART remains in a standby mode until automatically activated by an X Band Radar sweep from any vessel in the vicinity. The SafeSea S100 transmits a series of pulses which are displayed on the ship’s Radar as a line of dots, providing a bearing to the survival craft.


SKU: 710S-00607

Categories: SafeSea

The SafeSea S100 Search and Rescue Transponder (Radar SART) is a dedicated radar transponder that complies with IMO SOLAS regulations.

The International Maritime Organization (IMO) mandates the Global Maritime Distress and Safety System (GMDSS) carriage requirements for Search and Rescue Transponders (SARTs). Ships subject to GMDSS regulations, including passenger ships, cargo ships over 300 gross tonnage, and vessels engaged in international voyages, are required to carry at least one S100 SART. The S100 is a compact radar SART that is crucial for aiding in the location of distressed vessels by responding to radar signals from search and rescue units. The S100 radar SART meets specific performance standards outlined by the IMO, ensuring the products reliability and effectiveness in distress situations. Compliance with these requirements is essential to enhance maritime safety and facilitate timely search and rescue operations.

  • Superior battery life – even at -20°C
  • User-replaceable battery
  • Non Hazardous battery
  • Five-year replacement interval
  • Compact size for easy liferaft packing
  • Supplied with storage bracket
  • Pole Shown in images supplied separately (Order Part Number: 711S-01802 SART Mounting Pole)


Carriage requirements

  • SARTs are required on all IMO SOLAS vessels on international voyages:-
    • One on 300-500GRT
    • Two if over 500GRT
    • One SART per every four liferafts on ro-ro passenger vessels
  • Nationally mandated vessels, including fishing vessels, passenger craft, commercial workboats, etc
  • Most Super and Mega yachts are required to carry a SART, especially if covered by the MCA code of practice, which is recognized by many countries.
  • Voluntary fit vessels will also benefit by carrying a SART

Need to upgrade to the new AIS EPIRB Requirements?  Check out the new SafeSea EPIRB3 Pro


Frequency range


Radiated output power

>26dBm eirp

Battery Type Lithium Primary


Lithium/Iron Disulfide (Li/FeS2)

Operational Life

>96hours standby plus >12hours operational

Battery Replacement Interval



Operating Temperature Range

-20°C to +55°C

Storage Temperature Range

-30°C to +70°C


>10metres at +20°C




Body Diameter (max)

65mm (82mm)

Standards and Approvals

IMO regulations

A.694(17); MSC.247(83)

International Standards Radio


International Standards EMC


European approval

Marine Equipment Directive A.1/4.18

USA Standards

FCC CFR47 part 80.1101

Your Ocean Signal product is warranted against manufacturing defects in materials and workmanship for a period of 2 years from the date of purchase and in accordance with the following conditions.


Ocean Signal will at its discretion, repair or replace faulty product free of charge excluding the cost of shipping. Proof of purchase from the original purchaser shall be required in order for a warranty claim to be valid. All claims shall be made in writing to Ocean Signal or an approved service dealer or


Ocean Signal shall not be liable to the buyer under the above warranty:


  • for any repairs or modifications carried out on the product using parts that are not supplied
    or approved by the manufacturer Ocean Signal including batteries and for work carried out
    other than by Ocean Signal or approved service dealers,
  • for any part, material or accessory that is not manufactured by Ocean Signal, the consumer
    will be covered by the guarantee / warranty offered to Ocean Signal by the manufacturer or
    supplier of such a component,
  • for product which has not been fully paid for,
  • for any product supplied by Ocean Signal to a customer under an alternative warranty or
    commercial agreement,
  • for the cost of shipping product to and from the customer.
  • The Battery is only warranted until the date of expiry and provided the unit is tested in accordance
    with the information in the user manual.


This warranty does not affect your statutory rights.

Why should I carry a SART?

A SART is designed to aid the rescue authorities locate you in emergency. Although it is not a primary alerting device, like an EPIRB, it will guide the rescue craft to you by displaying a position and bearing line on the rescue craft’s radar.

What is a Radar SART (Search and Rescue Transponder)?

A Radar SART is a distress signaling device designed to enhance the detection and location of vessels or survival craft in emergency situations.

How does a Radar SART function during distress situations?

When activated, the SART responds to radar interrogation by transmitting a signal which generates 12 blips on the radar and turns into concentric circles as the range between the two reduces

Are Radar SARTs required by maritime regulations?

Yes, Radar SARTs are required by maritime regulations, particularly for vessels subject to Global Maritime Distress and Safety System (GMDSS) requirements, such as commercial ships and passenger vessels.

How is a Radar SART activated and deployed in an emergency?

In an emergency, a Radar SART is manually activated and deployed either on the vessel or on a survival craft, such as a lifeboat or liferaft. It should be turned on and kept above the water surface as high as possible to ensure maximum effectiveness.

What is the range of a Radar SART's signal?

The range of a Radar SART’s signal can vary depending on factors such as the height of the radar antenna, weather conditions, and sea state. However, it is generally effective within several nautical miles.

Can Radar SARTs be used in conjunction with other distress signaling devices?

Yes, Radar SARTs can be used alongside other distress signaling devices such as EPIRBs (Emergency Position Indicating Radio Beacons) and VHF radios to enhance the chances of rapid rescue and communication.

How often should Radar SARTs be tested and maintained?

SARTs should be tested regularly as part of routine maintenance procedures, following manufacturer guidelines. They should also undergo an annual inspection to ensure proper functioning.

Are there specific mounting requirements for Radar SARTs on vessels?

SARTs should be mounted in a location on the vessel or survival craft where they can be easily accessed and deployed in an emergency. Mounting should also consider factors such as interference with radar signals and exposure to water.

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