1600 Ton Master test VS 1600 mate test

I am wondering if anyone has any info on the 1600 ton masters test. I have heard that tides and currents are not on the test but stability is. I am just trying to figure out what exactly the difference between the mates test is VS the masters test. I am having a tough time finding any real difference with my study material. If anyone has any first hand experience with the two the info would be greatly appreciated.