Originally Posted by Supermane
If you are looking to switch then you'll actually need to switch martingales. Standing martingales are illegal in the jumper ring (over a certain height, which I currently can't remember)
You cannot use a standing martingale in the jumper ring if the division offers $5000 or more. So it's not really restricted to height, but divisions offering that much are usually higher jumps.
Also with higher jumps a standing martingale becomes dangerous