Always having dreams about big boats (eg titanic) ?

i always have dreams that i am on a boat and it always ends up tipping (I always survive). it always tips on the side or bottom and most times i am either on the top of the part that is not submerged or jumped off onto a another boat near by (weird; i know). what does that mean. i have them often. but not all the time and i have never been on a big boat before. I am dreaming like titanic boats with different people on it (friends or family). hellp.