Depth mask problem

I`m creating a speed boad game, so I stumble upon water in boat problem. Wherever I see, there is only one good solution - depth mask, found on this site:
http://wiki.unity3d.com/index.php?title=DepthMask

But as of unity 5.4f test scene doesn`t work on my version. Do anyone know this issue? Here is my tiny test scene (will be avaible for some time) 611kb:
https://www.dropbox.com/s/gszd3r74vqx94nx/Test space.zip?dl=0

there is my primitive fbx for test only, because this one is pc build, and jar 3d from original test scene, don`t like pc

Maybe somebody know solution to it, or different solution, I would be really greateful!