Q10 : Why the waypoints of my track are ''jumping'' around (multiple lines crossing over lines)?
A successful GPS fix requires a clear sky to complete, especially when you initialize or "cold start" i-gotU GPS Data Logger. Surrounded by the high buildings, inside the tunnels, or in the environment with strong RF interferences might stop you to get i-gotU GPS Data Logger located.
You probably stayed in the environments above, so i-gotU can not get you very accurately and resulted to jump around. Please try to stay at the same position (do not move) in the clear sky and check if it is normal.
Moreover, you may go to the ''Attributes'' of the track, and to check the Opimize Track Waypoints opition. It will revise the track and remove redundant waypoints. It should can be able to improve the result of your track.