Hey, how is life in the 3D world?

I have a problem with the bump map of my blin material. Or exaly i just dont know how to use 2 different bump maps on one material (or if it is even possible).

I have a Sphere with a blin material assigned to it. I gave it the texture of the earth.

1But now i have a bump map of the earth where you can see the mountains. I assigned this bump map to my texture so all the continents of the earth look realistic.

2But i also want to make my oceans look realistic. So i wanted to give it smal waves. I have a Mask of the earth so that the waves do not have effect on the surface of the continents.

I have tested the effect in 2 different scenes, one for the bump mapping of the continents and one for the bump mapping of the oceans. It looks great to me .

But how can i get these two Bump settings in one texture?

Thanks