"To port around" - as far as I can recall from the books I've read, Murdoch first ordered the ship to turn "Hard to port" as well as ordering the engines to reverse (in order to brake). The movie showed the problem - the engines first had to slow down and STOP before they could be put into reverse, so it wasn't really possible to change the Titanic's speed enough to make a difference. (Also, I vaguely remember that only two of the three propellers were able to go in reverse, so the ship didn't have as much power to stop as to go foreward.) Once the ship began (slowly) turning to port, Murdoch ordered "Hard to starboard" - this is "porting around" the iceberg. If they had just kept going to port, the ship's stern would have swung around until it hit the iceberg because of their continuing momentum foreward. By steering to starboard, Murdoch was trying to pull the stern of the ship out of the path of the iceberg, and in effect "curl" around the iceberg without hitting it. They were too close, and the ship was too big to and had too much momentum to be able to pull off the manoeuvre.