Spirit's GPS and INS combination is the best of all teams in the 2005 DGC!

Northrop Grumman's LN-270 Inertial Navigation System (INS) is used by Spirit to combat multipath errors, satellite loss, and other interference. Her twin holistic NavCom GPS units, plus INS, and DMI are accurate to 67 MPH.

GPS:  G(lobal) P(ositioning) S(ystem)

DMI:  D(istance) M(easurement) I(nstrument)