With the experimental study in Zhejiang, we find: at first, income and expenditure are positively correlative and nonlinear correlation makes the invisible refinement to linear relation, then with the income increasing, nonlinear refinement becomes obviously negative modification.

Evaluation methods and were proposed,and analysis was made concerning 200 km uninterrupted positioning on non-stop vehicle,with emphasis made on the setting of navigational calibration point and its effectiveness.