In recent years, study of location identification by mobile phone has been attracting a lot of attention. Especially, contents of mobile phone GPS are increasing for the purpose of various kinds of applications, such as games. navigations and etc. So far, many researchers measured GPS performance by conventional GPS devices, but a few people study mobile phone GPS. In this paper, we measured mobile phone GPS using various types of terminals at some circumstance and at the same time. As for the tests, we investigated and evaluated about the test results including distance errors and direction errors. The reduction methods for such errors are also described.
