Navy Blue Sea

I am sea of navy blue. I am constantly in motion. Some people on me have 'mal de mer' , but they need to take more care. I am sea of navy blue. I swell, but can be calm. People like it when I am calm, but it's all the same to me. I am sea of navy blue and I adore my colour. Most seas are green, I think, but I am special... Sail on me. ------------------------------------------------ 12/27/2015 Contest - Your Choice (10) Personification Sponsor - Brian Strand, 1st place win