GPS for UGV

Is there a recommended GPS unit for UGV's? Does the IMU work well enough with regular GPS modules to keep a vehicle on the road?

I'm just wondering if i were to program a rc car to go around a large track, what would i need so that it would not go off the track. It seems like regular GPS modules wouldnt be able to be precise enough(although the IMU would)

Any suggestions?

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