High average speed is roughly synonymous with maintaining stable pressure. The helmsman must be tuned into the pressure and steer to keep it stable, resisting the temptation to ride waves low too long with little pressure on the sails. Fast rides down the wave may be fun, but the boat often gets stuck at the bottom of the wave, loses speed, then feels a sudden pressure build on the sails. Boatspeed peaks down the face of the wave, and then plummets into a valley at the bottom. From this position the helmsman must either wait for the wave to pass or head up dramatically to get the boat going again. With proactive steering the helmsman is sensitive to the dropping pressure and is looking for a path of lower resistance so the boat does not slow excessively. The top speed may be lower, but the bottom speed, from which the boat can readily accelerate to launch speed with the next kinetic opportunity, remains much higher.