隨著通訊技術的進步，傳統單主站即時動態（Real Time Kinematic，RTK）定位已演化出虛擬主站（Virtual Master Station，VMS）即時動態定位的新技術。臺南縣e-GPS系統因主站僅分布於臺南縣境內屬於區域型服務網，為了解系統服務範圍而進行實地測試。本實驗測試點最遠至西螺，經實地測試結果定位精度並未隨距離增加而有劣化。除北興國中外，其餘各點之水平精度均優於1.8㎝、高程精度均優於3.8㎝。因此，臺南縣e-GPS系統服務範圍應可涵蓋雲嘉地區。
至於縣內測試點，除於正常（內插）狀態下進行即時定位，另模擬外插狀態進行即時定位。經測試結果，內插定位精度並無優於外插定位精度。無論是內插或外插狀態，其VMS-RTK定位之平面精度均優於2.3㎝，而高程精度均優於3.5㎝。其中以七股、關廟及南化等3座主站訊號進行定位之精度最差，其餘主站網形之定位精度於平面方向均優1.3㎝，高程方向均優於2.6㎝。

Along with the improvement of communication technique, conventional single master station RTK positioning has evolved to a new technique - Virtual Master Station (VMS) Real Time Kinematic (RTK). Since the master station is located within the Tainan County, the e-GPS system (VMS-RTK) in Tainan belongs to a regional network service and in order to know the service boundary of the Tainan e-GPS system, a test on its practicability is necessary. The most distant test site in this experiment is Hsilo; however its positioning accuracy does not deteriorate with the increase of the distance. Besides Pei-shin junior high school, the horizontal position accuracy of other test sites is within 1.8 cm, the height component accuracy within 3.8 cm. As a result, the service boundary of the Tainan e-GPS system can cover Yunlin and Chiayi areas.
We also test the positioning accuracy of the sites outside the Tainan County e-GPS system. Test results show that the accuracy is similar between those within and outside the network, the horizontal positioning accuracy of VMS-RTK is within 2.3 cm and the height components accuracy within 3.5 cm. The network positioning accuracy of Chigu, Guanmiao and Nanhwa master stations is not as good as the other master stations, whose horizontal positioning accuracy is within 1.3 cm and within 2.6 cm for the height component.

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