Harry S. Truman once said, “There is nothing new in the world except the history you do not know.” This quote (and many others like it) warns us all that we must know our history to avoid repeating the mistakes of the past. It comes as no surprise that this also applies directly to skydiving.

Wikipedia defines target fixation as “an attentional phenomenon observed in humans in which an individual becomes so focused on an observed object (be it a target or hazard) that they inadvertently increase their risk of colliding with the object.” Motorcyclists, automobile drivers and even fighter pilots flying strafing runs during World War II have focused so intently on an impending hazard that they actually maneuvered directly into it. And skydivers fall prey to the phenomenon, too.

When you want to check out a new main parachute, chances are you’ll make a solo jump, open higher than usual and spend some time flying the new wing to get used to how it handles. Almost everyone who jumps a new main canopy does. After all, it makes sense. It’s a mystery how the new parachute will steer and flare compared to what you are used to, and who wouldn’t want to make a few jumps on it under controlled conditions with plenty of altitude to learn how to fly it?

A properly sized and adjusted harness-and-container is essential to your safety both in freefall and under canopy. It’s likely that many jumpers who are reading this right now are in real danger of coming out of their harnesses during their next skydives and don’t even realize it.