Once the boat reaches 8 knots, you trim on the sails and head up. But you won’t stay at 8 knots. Instead, you’ll see 8.1, 8.2 or even 8.3. The reason for this is that, usually, there’s a five- to seven-second averaging on the boatspeed. That prevents the number from jumping all over the place, which is good. But the downside is that if you actually wait until you hit that number, you’ll be too late. You tack, go down to 6 knots, and then start leaning on it to accelerate. So you could already be at 8 knots, but because the boatspeed is averaging over the past five to seven seconds, including the current value, it might read only 7.8. To avoid that problem, come up before it gets to the target number. You might need to ignore the target speed for the moment and start coming up at 7.5 or 7.6. If you don’t, you’ll end up pressing too long, and then, as you come up, the number might say 8.4. Then you’ll sail high, trying to get back to the target speed, and the up-down cycle will continue until the instruments slowly get to the right number. And that’s simply because you’re not taking into consideration that the speed is averaging when you’re looking at it. When you’re at the final angle and your sails are fully trimmed, you want to be at your target speed. If it doesn’t jump over, you’ve done it correctly.