This paper approaches the reference datum of GPS and electronic map from concepts model, and analyses the basic relations of coordinate transformation.

从概念模型的角度探讨了GPS和电子地图的参考基准问题。

youdao

This is why most improvements in bizjets during the last 40 years have come from outside the industry--electronic engine controls, global-positioning satellites, moving-map displays, downloadable real-time weather, etc.

FORBES: Cheap Jet Update