A boat sails the course when
- (a) she starts;
- (b) a string representing her track until she finishes, when drawn taut,
- (1) passes each mark of the course for the race on the required side and in the correct order (including the starting marks),
- (2) touches each mark designated in the sailing instructions to be a rounding mark, and
- (3) passes between the marks of a gate from the direction of the course from the previous mark; and then
- (c) she finishes.
A mark that does not begin, bound or end the leg the boat is sailing does not have a required side.