calm down guys, no name calling here

1) the s variable is the speed you want the boat to move at. thei higher it is, the faster the boat moves, but the more it "jumps"
2) it wasnt hard chanign it to xs and ys
3) pos is just for checking if the boat has traveled far enough. there are 36 pixels between one tile and the next, so when pos==36, it is at the next tile and the moving should be stopped.
4) good question. i would sugest using a 2d array and learning tilebased game making. hunt down tonypa for that