mspeed            155 core/gps.c     static t_rectangular mspeed;                           // actual position of regressionin m/s (N/E)
mspeed            284 core/gps.c         geo2rect                (&speed, &mspeed, ist.lat_w);                   // Convert to m/s
mspeed            285 core/gps.c         rect2polar              (&mspeed, &pspeed);                             // convert to direction and speed.