I'm sorry everybody but I've been looking all over this place trying to fimd out what IMU stands for. Will someone please en-lighten me?

Inertial Measurement Unit.

thank you very much!

Hi. Thank you for the inquiry. IMU is Inertial Measurement Unit. It is an electronic device that measures and reports the Drone's specific force, angular rate, and sometimes the magnetic field surrounding the Drone, using a combination of accelerometers and gyroscopes, sometimes also magnetometers.

DJI Stephen Posted at 2018-7-10 07:21
Hi. Thank you for the inquiry. IMU is Inertial Measurement Unit. It is an electronic device that measures and reports the Drone's specific force, angular rate, and sometimes the magnetic field surrounding the Drone, using a combination of accelerometers and gyroscopes, sometimes also magnetometers.

Thank you for  that very technical information. No wonder my drone cost me so much.