I have downloaded vectornav driver from here. I could see /vectornav/IMU, /vectornav/Mag, /vectornav/Pres, /vectornav/Temp data. But when I echo /vectornav/GPS and /vectornav/Odom, nothing is printed on the terminal. I checked GPS fix on cutecom(it is showing as 3). Is there any parameter I need to set to view the GPS data?