LRIT conformance testing

Equipment testing

In order to comply with the LRIT regulation, the LRIT communication capabilities of the onboard equipment will have to be certified by an ASP (Application Service Provider) recognized by the Administration, or an authorized LRIT Testing ASP. These Testing ASPs can issue Conformance Test Reports (CTR) for the terminals that pass the test.

We recommend you to have your equipment tested as soon as possible, and well in advance of the first planned radio survey for your ships, for these test reports will also be required for radio surveys and inspection from 1st July 2009 onwards. If the test shows LRIT conformance of the terminal, CLS issues a Conformance Test Report (in English) on behalf of the Flag authority.

CLS has operated satellite systems for over 20 years, specializing in vessel tracking and location services. CLS counts 300 employees worldwide and operates 40 instruments on board 30 satellites.

LRIT compliant terminals

There is no list of compliant LRIT terminals as each terminal must be tested by an authorized Testing ASP to attest its LRIT conformance. Inmarsat-C/mini-C equipment already installed onboard the ships will be most frequently used for LRIT purposes.

However, you may also use dedicated LRIT devices that are based on either Iridium or Inmarsat D+/IsatM2M technology. Please contact your preferred reseller for more information regarding the compliance of your specific device. You will find an up-to-date list of compatible hardware on the main manufacturers’ websites: ThraneFuruno and JRC.

For Iridium-based LRIT compliant terminals: please contact CLS directly by clicking here, or download the  Thorium LRIT  factsheet.

For Inmarsat D+/IsatM2M you may contact our preferred partners: Skywave and Satamatics

Test your LRIT equipment now!

ll Flag states require LRIT conformance prior to 1 July 2009, in order to comply with IMO Resolution MSC.211(81) . Operators are advised to have their terminals tested as soon as possible, even if their ships are already equipped with Inmarsat C terminals.

CLS can start testing within 2 days after having received your test purchase order. All tests will be done remotely from CLS, so there is no work onboard your ship involved. If the test shows compliance of the terminal, CLS issues a Conformance Test Report (in English) on behalf of the Flag authority.

Our testing ASP procedures follow the MSC.1/Circ.1307 dated 9 December 2009, replacing the previous Circ. 1296. The tests are done individually for each terminal (Inmarsat or Iridium). Each test lasts about 30 hours and includes:

  • Remotely uploading of the CLS DNID into the Inmarsat C terminal, so CLS can communicate with the ship
  • Series of automatic position reports at 1-hour, and 15-minute intervals
  • Individual polling


Conformance Test Report

CLS issues LRIT Conformance Test Reports (CTR) on behalf of many Flag authorities. CLS will forward all successful test results directly to the owner of the ship and his Flag administration.


Contact us to find out more

To register online for vessel testing, please click here.
Flag Administrations:
To find out more, please contact:
Ship Owners:
For more information on vessel testing, please contact: