We used the same systems and logic to get to the moon & back and to pinpoint dropping weapons from space after launching them using a missile from underwater! All using a known start point and measuring velocities to be gained or lessened. The components only get smaller.
I just ordered in one for my birthday. If it works as advertised, I can be better aware of all my weights. The only time I CAT Scaled my "rig", I was over weight on my TV RAWR and my TT GAWR. I removed a lot of weight from both TT & TV but I want to try to stay within my ratings. I let you know how it goes by next weekend, it's due in early in the week. Whenever I get a chance to compare the readings to scales this summer, I will.