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COUNTDOWN RESUMES

Engineers replaced a faulty navigation device and restarted the shuttle Columbia's countdown Monday with launch on track for 8 a.m. Wednesday, two weeks late because of a flurry of unrelated technical glitches.

Columbia, its seven-member crew, 30 rats and some 2,500 baby jellyfish were grounded Saturday, just 45 minutes before the ship's planned launch, by a faulty navigation device called an inertial measurement unit, or IMU.A spare IMU was installed aboard Columbia overnight Saturday and engineers spent the day Sunday putting the high-tech device through numerous tests to make sure it would work properly.