Using GEO satellites enables Bullitt to provide stable international coverage. A user does not have to change their existing behaviour, you are generally stationary when you message, using a LEO connected device you have to follow the Satellite to maintain a signal. GEO connected devices also provide faster access, latency is ~10 seconds compared to ~15-120 seconds for LEO services.
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We can connect to a number of geo-satellite constellations including Inmarsat, Echostar and others.
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It takes approx. 500 milli seconds to bounce a message to the satellites and back to the ground station. Any message is then translated into the IP network ensuring that overall latency is ~10 seconds compared to ~15-120 seconds for LEO services
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There are more LEO satellites but that is the only way they can get coverage. GEO satellites are positioned above the equator and effectively orbiting the earth at the same speed as the earth rotates. Effectively they appear to be stationary in the sky, easier to locate and communicate with.