GMDSS-GOC-L3.1

Inmarsat and Iridium: recognised mobile satellite services

GMDSS-GOC-M3 · Satellite communications · GMDSS-GOC-M3-A Inmarsat and Iridium as recognised services, and MSI by EGC.

For decades 'satellite GMDSS' meant Inmarsat. Since **Iridium** was recognised, a yacht may meet A3 (and, with Iridium, A4) through either system, **subject to flag acceptance**. The GOC holder must be able to send a satellite distress alert and message on whichever terminal is fitted.

Independent study. xplor is not an accredited training provider and awards no certificate or Certificate of Competency. The GOC is issued by the MCA only after an MCA-approved GMDSS course and examination at an approved centre, and needs an MCA STCW endorsement for service on UK ships. AI-drafted content pending subject-matter-expert review.