I' running RaceChrono Pro V5.4.6 with XGPS 160 with firmare 1.5.1.
I've alwayd had problems with gps accurancy when turning. In particular speed and position are quite wrong.
Here an examplehttps://drive.google.com/file/d/0B_Vn9whMEwb8OXBsUmk5bXdLbVdQZV84a3FLM2d4TFFfbjdZ/view?usp=sharing
Blue line: GPS speed. 110.8
Green Line: speed from OBD 162. Not the most accurate source but is in line with my expected spped in there
pink line: Coordinates accurancy 0.79 DOP (To be honest not sure what this parameter is).
I've tried firmware 2.5.4 on the antenna with no changes.
The antenna is recording at 10 hz. On straigh line no issues.