When it comes to pinging the starting line, the biggest mistake you can make is not being closehauled when pinging. If you are beam reaching on the line and the unit is on the line, the unit draws the imaginary line on the actual line. However, when you are starting, your bow is well in front of your physical unit and so you would be over early. On our J/70, we work very hard to be closehauled, which means the unit is drawing its imaginary line 7 feet back from the actual start line. Then when we start, at zero meters, our unit is 7 feet off the line but the bow is right on the line.