Iridium CertusSM is a new portfolio of global satellite services powered by Iridium® NEXT, a ground-breaking L-band global satellite constellation, which features a cross-linked Low-Earth Orbit (LEO) architecture to provide 100% coverage over the earth’s surface. With SAILOR 4300 providing your on board link, you are guaranteed high bandwidth IP connectivity and three high-quality voice lines for global calling wherever you are.