OK, so suppose I am not interested in measuring small fluctuations in the force of gravity, because I am not looking for buried iron ore deposits or big meteors.
Suppose I want to measure the direction of the graviational force, and I want to do this from a moving platform like a car or an aircraft.
If I get a 3D MEMS accelerometer, that will do a good job if the vehicle is stationary or moving at a constant velocity, but otherwise, it won't.
Is there another way to measure the direction of the gravitational force which will work in an erratically moving vehicle ?