This tattoo has troublesome spacing. The creator probably didn't realize that the nikud (vowels) do not usually receive spaces of their own.
The verse is supposed to read, "Be still and know that I am God". At first glance, however, it distinctly reads "Be still and know that I am the god of sea". That happens because the word ELOHIM (God), when separated in two parts by a space, will read EL HA-YAM (god of the sea). Cute, really.