LRIT aims to collect and disseminate vessel position information received from IMO member States’ ships. It must be carried on any ship that is engaged in an international voyage and falls into the following categories:

  • All passenger ships;
  • Cargo ships of 300 gross tons or more;
  • Mobile offshore drilling units.


LRIT also provides satellite-based, real-time position reporting capabilities. Any ship sailing within 1,000 nautical miles of the US coast or heads for a US port (engaging in international voyages) must have LRIT.

According to the LRIT international guidelines, the default LRIT ship-reporting rate is every six hours through a ship’s LRIT terminal.

NAVCEN, along with the Office of Commercial Vessel Compliance, developed a program to identify vessels that have not reported their LRIT status and are not in compliance with 33 CFR §169.230. Once notified, local US Coast Guard units enforce the LRIT reporting requirement.

Countries that fall under the purview of the SOLAS convention can share the necessary marine security information along with all other required information about the ships that sail through the countries’ coastal boundaries.