Are you trying to get the height on the server? I myself tried that before realising the waves are client-side 
No I did it on the client. Did you manage to do it?
Yes, I just had a lookup table with each Bone as the key and their height as the value, and the height is the Y position of the bone’s WorldCFrame minus a base Y position (10 in my case), and it gets updated every RenderStepped along with the gertsner thing.
So to get the height for a specific Bone you just do lookup[Bone] and itll return the height. Id also split the ocean up into chunks of 4 bones so you can get the average height of a specific area