The reason why the rule says coming from the right hand turn and five seconds is because that is the approach to the S/F line and the start of the race.
If you were going into the right hand turn with five seconds left to the start, you would not have to hold a lane......unless there was another boat next to you and then the standard rules of racing and holding lanes then applies.
If you are the only boat coming down for the start with 5 seconds left on the start clock, and you do not hold your "lane" whether it be a straight line or a turn, the CD should call you for a penalty. After all, the only reason you would not be holding your lane is because you are trying to scrub time off the clock to avoid a jump start.
In the NAMBA rule book, there are four turns not two. I have heard announcing in years past back east call the turns one through four. On the west coast, you will hear turn one (the left turn) and turn two (the right turn) with them being described at enter, point, and exit.
The best thing to do is to rely on the communication of your pit man no matter what terminology the CD uses. A good pit man will always see a dead boat before a CD can announce it.
.................. and hitting a "called dead boat" is a DQ and zero points for that heat.
........ check with the race committee of the Nats but its a pretty good bet that the above will be what you will see.
Al Waters
NAMBA Vice President
NAMBA Scale Unlimited Chairman