Personal navigation and guidance for blind person is a valuable and difficult task. Not only the vocal interface and map information, but the positioning also has an important role. Among many configurations, Global Navigation Satellite System (GNSS) based such as GPS, are featured with economic signal and also wide availability. In this study, a single frequency GPS receiver is studied for its dynamic performance. The positioning accuracy and reliability of a L1 only GPS receiver is field tested in this experiment. Study items include SPS and PPP with both stationary and moving mode observations. Post-processed kinematic differential GPS is utilized as the reference. It is found while the SPS has the largest uncertainty as expected, PPP accomplished significant improvement.