SpaceX plans to launch the RRT-1 mission —perhaps an advanced GPS satellite — from Florida's Space Coast tonight (Dec. 13).

SpaceX is gearing up for a twice-postponed launch that will attempt to take off from Cape Canaveral on Monday evening. The RRT-1 mission was set to launch aboard a Falcon 9 rocket on Friday but was postponed because of high winds. A targeted backup attempt on Sunday was also pushed back, but SpaceX did not give a reason why.

SpaceX is targeting Monday evening for launch of the RRT-1 mission from Brevard County, according to a news release.

The effort, dubbed Rapid Response Trailblazer, was meant to demonstrate the ability to quickly plan and launch a mission in around six months.

SpaceX launched the SES O3b mPOWER mission on a Falcon 9 rocket from Launch Complex 39A at Kennedy Space Center in Florida on Tuesday.