In what sense? Basically if you have your TACAN and BRC line setup in your jet, you fly about a mileish past the boat, at 350 knots and 800 feet, then start your turn at approximately 1G per 300 knots, so 3-3.5G's in a normal turn. Once you are 180 degrees from the BRC you should be spot on laterally. Get yourself trimmed on speed then look at the boat. When you can see the white round down at the end of the boat, it's time to start your base turn. Give it the beans, start a 30 degree bank, downward turn. Use your radar altimeter to help here. If you have it set at 450 feet you should get the warning just as you roll out behind the boat. Remember to chop the throttle as you roll out or you're going to lift off to the moon as the jet gains all that lift from full flaps. Feed the throttle back in as the jet settles.
If you mean how far laterally you should be on setup, before starting any turns, it's pretty close. Gauge it visually, but it's just a couple hundred feet laterally at most. In RL you would be able to wave at the deck crew and have them see you.
Now if you're talking a shit hot break right over the round down, that's a different story
This is a hot break: