1.   And only then were errors discovered in the original navigational data.

2.   It veered off course after Lockheed engineers sent JPL navigational data that they had failed to convert to metric measurement units.

3.   One early version was built around the navigational data that helicopter pilots get from global positioning satellite receivers aboard their craft.

4.   Posted next to Wetherbee, astronaut Mike Foale will relay distance readings from a bank of computers displaying navigational data.

5.   Some of the more sophisticated devices offer not just position information but also other navigational data, like range and bearing relative to a certain point.

6.   They would have to know how to feed course corrections and navigational data into the system and how to turn it off and manually fly the plane.

7.   But it did contain a global positioning system that might contain some useful navigational data, Hammerschmidt said.

8.   Investigators ruled that the crew was complacent and relied too much on automation, missing several opportunities to discover the navigational data error through map analysis.