CAPE CANAVERAL, Fla -- The unmanned SpaceX rocket launched successfully on Monday morning at 11:15. Today's liftoff was the fourth attempt. Two countdowns were scrubbed and a third was postponed due to technical and weather problems.

This is the first of two SpaceX launches for Obrcomm Inc., a New Jersey-based provider of machine-to-machine networks that track products shipped around the world and monitor the health of heavy machinery.

The 224-foot Falcon 9 rocket is carrying the first six of 17 Orbcomm Generation 2 satellites upgrading the company's existing constellation in low Earth orbit.

SpaceX will try to steer the Falcon 9's first stage to a soft landing in the Atlantic Ocean for recovery by ships, a step toward developing a reusable booster.

Mobile Users: Mobile-optimized launch coverage.

SpaceX a 'go' for Monday launch

SpaceX rocket blasts off for space station

SpaceX spooks nearby cattle as it tests its Falcon 9 Resusable rocket in Texas. VPC

The SpaceX mission seeks to resupply the International Space Station.

SpaceX launched its Falcon 9 rocket with Dragon on board headed toward the International Space Station. Posted May 22, 2012. NASA-TV

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